Matthew Henry on Psalms 50:16-23

Hypocrisy is wickedness, which God will judge. And it is too common, for those who declare the Lord's statutes to others, to live in disobedience to them themselves. This delusion arises from the abuse of God's long-suffering, and a wilful mistake of his character and the intention of his gospel. The sins of sinners will be fully proved on them in the judgment of the great day. The day is coming when God will set their sins in order, sins of childhood and youth, of riper age and old age, to their everlasting shame and terror. Let those hitherto forgetful of God, given up to wickedness, or in any way negligent of salvation, consider their urgent danger. The patience of the Lord is very great. It is the more wonderful, because sinners make such ill use of it; but if they turn not, they shall be made to see their error when it is too late. Those that forget God, forget themselves; and it will never be right with them till they consider. Man's chief end is to glorify God: whoso offers praise, glorifies him, and his spiritual sacrifices shall be accepted. We must praise God, sacrifice praise, put it into the hands of the Priest, our Lord Jesus, who is also the altar: we must be fervent in spirit, praising the Lord. Let us thankfully accept God's mercy, and endeavour to glorify him in word and deed.