Psalms 31:7

I will be glad and rejoice in thy mercy -I will triumph and joy in thy mercy; that is, in the mercy which he had already experienced, and in that which he still hoped to enjoy. He had had abundant proofs of that mercy; he hoped for still further proofs of it; and he says that he would find his joy in that, and not in what idols could give. For thou hast considered my trouble -In times past and now. He felt assured that his prayer would be regarded, and that God would relieve and deliver him. Thou hast known my soul in adversities -In the troubles that have come upon me.