Reason
Reason. The mental activity that enables a person to think, know, and understand.
There is no single Hebrew or Greek term exactly equivalent to the English “reason.” Instead, Scripture speaks of knowing, understanding, discerning, and the inner life of the heart, which together form a biblical view of reason. While Scripture acknowledges the wisdom and understanding of those who do not acknowledge God (cf. Isa 29:14), thinking rightly is ideally set within a relationship to God, rather than as an autonomous, self-sufficient faculty. It is God who “gives wisdom to the wise and knowledge to those who have understanding (Dan 2:21; cf. 4:34).
Being created in the image of God has crucial implications for human reason. Human beings reflect God by their capacity to think, know, and understand, but they are also called to use this capacity in harmony with their Creator rather than in independence from Him. Autonomous reason, as idealized by rationalist philosophers during the Enlightenment, stands in tension with the biblical perspective. In Scripture, reason functions rightly when it is informed and guided by God’s revelation, supremely as we find it in Holy Scripture (cf. Rom 8:6-7). This is not a sacrifice of our intellect but the sanctification of our thinking, where we are called to do our reasoning as someone who stands responsible before God, because we are accountable to think in relationship with God and in harmony with God’s revealed will. In this way we can follow God’s invitation “to reason together” (Isa 1:18).
Several key biblical word-groups frame this understanding. The Hebrew verb yadaʿ (“to know”) appears over 950 times and is central for a biblical view of knowing. It can denote knowledge gained through the senses and is often used in statements such as “you shall know that I am the LORD your God” (Exod 6:7; Deut 4:35; 1 Kgs 18:37; Isa 49:23), where knowing is linked to God’s acts of self‑revelation in history. This knowledge is not abstract or merely speculative but arises from a practical experience of God and a living relationship with Him and is gained in our embodied human existence through our sensory experience (seeing, hearing). This does not exclude the cognitive dimension; knowledge includes acknowledging what God has revealed about Himself. There is, therefore, no “neutral” or “natural” way of coming to true knowledge of God, as though from a detached standpoint. True knowledge of God is best possible within a transformative relationship with Him, so that the wise do not boast in their own wisdom but in knowing the Lord (Jer 9:23–24).
This idea is captured programmatically in Proverbs 1:7: “The fear of the LORD is the beginning of knowledge” (NKJV; cf. Prov 9:10; 15:33; Ps 111:10; Job 28:28). This “fear of the LORD” is not cringing terror, but an attitude of committed trust, covenant loyalty, and reverent submission. It involves service, love, obedience, worship, and total surrender to God. Such faith does not obstruct knowledge; rather, faith in God is the starting point and liberating condition for genuine knowledge of God and His world.
In the Septuagint and the NT, the Greek ginosko (“to know”) usually renders yadaʿ. It can mean to notice, perceive, or recognize through the senses, but it also bears the nuance of personal, often trusting knowledge. This stands in sharp contrast to philosophical traditions that downgrade sense-based knowing to mere “opinion” (doxa) and reserve “knowledge” for abstract intellectual contemplation. The biblical writers employ Greek terms but continue and deepen the OT understanding of knowing rather than absorbing Greek philosophical concepts.
The NT thus carries forward the personal aspect of knowledge, especially in references to knowing God (Rom 11:33; 15:14; 2 Cor 2:14; 10:5; Col 1:10). God grants knowledge to believers (Mark 4:11), but this knowledge is not given to produce arrogance (1 Cor 8:1); it arises within a relationship characterized by love and obedience to God’s will. For this reason, those who boast are to “boast in the Lord” (1 Cor 1:31; cf. 2 Cor 10:17; Jer 9:23). When John says that Christians “know all things” (1 John 2:20 NKJV), this does not mean philosophical omniscience; it reflects the believers’ intimate relationship with God through the anointing of the Holy Spirit (1 John 2:20–21; 3:2, 5, 14; 5:13, 15, 18–20; cf. John 14:26). This love relationship with God is a strong motivating factor to seek an ever-deepening understanding of Him who is our creator, savior, and Lord and to comprehend more clearly the beauty and complexities of his creation.
The NT also warns against distorted forms of knowledge. Paul speaks of “what is falsely called ‘knowledge’” (1 Tim 6:20) and critiques a purely cognitive ideal of knowing in 1 Corinthians (1 Cor 8:1–2; 13:2, 8, 12; cf. 1:18–23) and elsewhere (Eph 1:17–18; 3:19). Knowledge apart from love and obedience becomes empty and even dangerous.
A second important OT term is bin (“to understand, discern”). The root is related to the noun bayin (“interval, space between”), from which the sense “to distinguish” or “to separate” naturally arises. Bin therefore conveys discerning insight, the ability to distinguish and to judge rightly, and so it designates a kind of understanding that transcends mere data-collection. This discernment, however, is consistently portrayed as a divine gift. Solomon’s request, “Give Your servant an understanding heart to judge Your people that I may discern between good and evil” (1 Kgs 3:9 NKJV), and the notice that God gave him wisdom and understanding (1 Kgs 4:29–30), show that moral and practical insight comes from God rather than arising from experience alone.
The closest Greek parallel to bin is synesis (“understanding, insight”), used in the Septuagint and the New Testament. Synesis denotes an “integrative” understanding that brings pieces of knowledge together in a coherent discernment ordered toward faithful action. As with bin, this insight is a gift from God, and the lack of such insight reveals a deep internal rejection of God (Rom 1:21). Under the guidance of God and by carefully listening to His word, human beings are capable to understand even otherwise mysterious things (cf. Rev 13:18, 17:9). The Bible also warns that our ability to think and reason clearly can be inhibited and negatively been affected by dulling our minds with alcohol (Prov 20:1; 23:31-35; Eph 5:18) and by extension other drugs and narcotics. Because our bodies are a temple of the Holy Spirit (1 Cor 6:19), we have a responsibility to keep them strong and healthy and to ensure that our minds are in good shape.
The anthropological center of biblical thinking and reasoning is expressed by the Hebrew leb (“heart”). Leb and its parallel form lebab occur frequently and denote the core of human existence. The heart includes the capacities of understanding, reasoning, receiving instruction, and exercising will and decision (1 Kgs 3:9–12; Prov 18:15; Isa 42:25). It discerns God’s works, fears the Lord, and puts righteousness and justice into practice (Prov 2). Thus, mental activities are not isolated intellectually but are embraced within the whole inner life of the person, where learning and thinking are a full-body experience.
In the Septuagint, leb is usually translated by kardia (“heart”), and more rarely by dianoia (“understanding”), psyche (“soul, life”), or nous (“mind”). This variety underscores the absence of a single term for “reason” in the biblical languages and contrasts with the central role of nous in classical Greek thought. In the NT, the terms heart and mind can function in parallel (2 Cor 3:14) or even synonymously (Phil 4:7). As in the OT, kardia often stands for the whole inner person, not just the seat of emotions.
Humanity in its natural, fallen state follows the “desires of the flesh and of the mind” (Eph 2:3), and sin affects the entire person, including rational powers. There is, therefore, a noetic effect of sin: human reasoning itself stands in need of conversion and renewal. In biblical thought wisdom and knowledge are never separated and we are called to “love the Lord your God with all your heart, with all your soul, and with all your mind” (Matt 22:37; Mark 12:30; Luke 10:27). Human beings become reasonable in the biblical sense when “we are taking every thought captive to the obedience of Christ” (2 Cor 10:5). By offering our bodies as a living sacrifice to God we are able to render God a “reasonable service” in which we are not “conformed to this world but transformed by the renewing of our mind” (Rom 12:1-2). In biblical thought, knowing encompasses the whole person and life, not merely the intellect, and it is grounded in God’s gracious self‑revelation and transforming work. This wholistic perspective culminates in our knowledge of Jesus Christ, who is “the way, the truth, and the life” (John 14:6).
