Adam Clarke on Psalms 31:7

Thou hast known my soul in adversities - When all forsook me; when none could help me; when I could not save my own life; when my enemies were sure that I could not escape; then I found thee to be my Friend and Supporter. When friend, so called, finds it convenient not to know his friend in affliction and poverty, then thou didst acknowledge me as thine own, all worthless as I was. Human friendships may fail; but the Friend of sinners never fails. Cicero defines a real friend, Amicus certus in re incerta cernitor: "A friend in need is a friend indeed." Reader, such a Friend is the Lord.