Unto thee, O Lord, do I lift; up my soul (comp. Psalms 86:4; Psalms 143:8). The Hebrew phrase does not mean a temporary raising of the heart to God, but a permanent setting of the affections on him (see Deuteronomy 24:15; and comp. Psalms 24:4).
O my God, I trust in thee (comp. Psalms 7:1; Psalms 11:1; Psalms 31:1-24. I, 6, etc.). Let me not be ashamed; i.e. do not disappoint my trust, and thereby bring me to shame (comp. Job 6:20). Let not mine enemies triumph over me. It does not appear whether the "enemies" intended are domestic or foreign foes. Either would triumph were David disappointed of a confident expectation.