John Gill Commentary Psalms 38:15

"For in thee, O Jehovah, do I hope: Thou wilt answer, O Lord my God." — Psalms 38:15 (ASV)

For in thee, O Lord, do I hope
That he would plead his cause against his accusers and revilers, and who sought his hurt; that he should be delivered out of their hands, and out of all his afflictions; that he should be healed of his diseases, both of soul and body, under which he laboured; and should again enjoy the light of God's countenance, and have the discoveries of his pardoning grace and mercy; and this was the reason why he was so calm and quiet amidst the unkindnesses of his friends, and the cruel usage of his enemies;

thou wilt hear ,
or "answer",

O Lord my God ;
in the midst of all his distresses of body and mind, he had not given up his interest in God, as his God and Father; which is the great blessing of the covenant of grace, and which ever continues; and is the great support of believers, under whatsoever they meet with in soul and body, from friends or foes; this his God the psalmist believed would not only hear his cries in his sore distress, but hear the reproaches of his enemies, and answer them in a providential way in his own time, by terrible things in righteousness to their conviction and confusion; and therefore he himself was silent.