Albert Barnes Commentary Psalms 91:2

"I will say of Jehovah, He is my refuge and my fortress; My God, in whom I trust." — Psalms 91:2 (ASV)

I will say of the Lord - I, the psalmist; I will take this to myself; I will endeavor to secure this blessedness; I will thus abide with God. In view of the blessedness of this condition, and with the hope of securing it to myself, I will adopt this resolution as the purpose of my life. It is what I need; it is what my soul desires.

My refuge and my fortress - I will say of Jehovah, My refuge and my fortress! I will address him as such; I will regard him as such. On the meaning of these terms, see the notes at (Psalms 18:2).

My God - I will address him as my God; as the God whom alone I worship; as the only being to whom the name “God” can properly be applied; as being to me all that is implied in the word God.

In him will I trust - I will repose that confidence in him which is evinced by making my home with him, and seeking permanently to dwell with him.