In God I will praise his word - The meaning of this seems to be, “In reference to God - or, in my trust on God - I will especially have respect to his “word” - his gracious promise; I will make that the special object of my praise. In dwelling in my own mind on the divine perfections; in finding there materials for praise, I will have special respect to his revealed truth - to what he has “spoken” as an encouragement to me. I will be thankful that he “has” spoken, and that he has given me assurances on which I may rely in the times of danger.” The idea is, that he would “always” find in God that which was the ground or foundation for praise; and that that which called for special praise in meditating on the divine character, was the word or promise which God had made to his people.
I will not fear what flesh can do unto me - What man can do to me. Compare the notes at Matthew 10:28 (notes); Romans 8:31-34 (notes); Hebrews 13:6 (notes).