The suppernatural relationship between God and human
It has well been said that the greatest ability is dependability, and this especially applies to the Christian life. We want God to be faithful to us, so is it wrong for God to expect us to be faithful to Him? Faithfulness is an evidence of faith, and faith comes from hearing and receiving the Word of God (Rom 10:17; 2 Thess 2:13). The psalmist described several areas of faithfulness in the life of the believer.
Two familiar biblical images combine in this verse: life is a path (vv. 32,35,101,128; 16:11; 23:3; 25:4) and God's Word is the light that helps us follow the right path (v. 130; 18:28; 19:8; 36:9; 43:3; Prov 6:23; 2 Peter 1:19). The ancient world did not have lights such as we have today; the people carried little clay dishes containing oil, and the light illuminated the path only one step ahead. We do not see the whole route at one time, for we walk by faith when we follow the Word. Each act of obedience shows us the next step, and eventually we arrive at the appointed destination. We are told that this is "an enlightened age," but we live in a dark world (John 1:5; 3:19; 8:12; 12:46; Col 1:13; 1 Peter 2:9) and only God's light can guide us aright. Obedience to the Word keeps us walking in the light (1 John 1:5-10).