Psalm 37:3 Trust in the Lord, and do good; so shalt thou dwell in the land, and verily thou shalt be fed.
Trust in the Lord is the required response to the grace and care of God. Faith receives the promises of life and salvation. “Whoever believes in him has eternal life.” “Believe on the Lord Jesus Christ and thou shalt be saved.” Trust makes real and alive the grace and salvation of God in Christ. Grace gives. Faith receives. We are justified by grace through faith. Saving faith is implanted in the heart through the gospel. “Faith cometh by hearing.”
Doing good follows from believing. The new man in us naturally does good. The old man, without faith, does not. Doing good is not added to believing; it is already a part of living faith.
The result of trusting in the Lord is living the new life in the kingdom of God (dwelling in the land). Faith lives in the spiritual, heavenly world. In that “land” we are always being fed and cared for by the Lord, as a good shepherd. Faith is an amazing gift, for by it we are saved, blessed, cared for, fed, comfortable and safe. Such faith comes and grows through the Word of God.