Psalms 37:31

“I have stuck unto thy testimonies, etc.] The word of God, the Scriptures of truth, and the doctrines contained in them. These he closely adhered to, was glued unto them as it were; having firmly believed them, he steadfastly professed them; nor could he be moved from them by any temptations whatever, notwithstanding the reproach cast upon them and him for their sake, or the opposition made unto them; O Lord, put me not to shame: or let me not be ashamed of the choice I have made, of the testimonies I adhere unto, of my hope and confidence in the Lord and his word; or suffer me not to do anything, any sinful action, that may expose me to shame and contempt.”

“steps--or, "goings"--for conduct which is unwavering (Psa 18:36).”

“The law of his God is in his heart - That is, he loves it; he thinks of it; he makes it the inward rule of his conduct: Deuteronomy 6:6; Psalms 40:8 The word “law” here is a general term for the truth of God - for all that he has revealed to guide men. As long as that truth is in the heart; as long as it is the object of love; as long as it is suffered to guide and control us, so long will our words and conduct be right. None of his steps shall slide - Margin, “goings.” The idea is, that his course will be firm and steady. He will not fall into sin, and his life will be prosperous and happy. This is in accordance with the general sentiment in the psalm, that religion tends to promote…”

“Heart - His thoughts, meditations and affections are fixed upon it. Slide - Slide, or swerve, from the rule, from God's law. Psalms 37:35”

“37:31 They have made God’s law their own: The godly internalize God’s wisdom and instructions (see 119:11; Jer 24:7; 31:31-34).”

“law: Psa 1:2, Psa 40:3, Psa 40:8, Psa 119:11, Psa 119:98; Deu 6:6, Deu 11:18-20; Pro 4:4; Isa 51:7; Jer 31:33; Heb 8:10 none: Psa 37:23, Psa 121:3 steps: or, goings, Psa 17:5, Psa 40:2, Psa 44:18 \*marg. Psa 73:2; Job 23:11; Pro 14:15; Eze 27:6 \*marg. Psalms 37:32”