Thou, through thy commandments - By the teaching and power of thy law.
Hast made me wiser than mine enemies - I have a better understanding of thee, of thy law, of the duties of this life, and in regard to the life to come, than my enemies have - not because I am naturally better, or because I have higher endowments by nature, but because thou hast made me wiser than they are. The rendering of this first clause of the verse now most approved by interpreters is, “Thy commandments make me more wise than my enemies are,” though this requires a singular verb to be construed with a plural noun (Professor Alexander). So DeWette renders it.
For they are ever with me - Margin, as in Hebrew, “it is ever with me.” The reference is to the law or commandments of God. The meaning is, that that law was never out of his mind; that he was constantly thinking about it; and that it unfolded such wisdom to him as to make him superior to all his foes; to give him a better understanding of life, its design, its duties, and its obligations, than his enemies had. The best instructor in true wisdom is the revealed word of God - the Bible.