Lord, who shall abide in thy tabernacle? who shall dwell in thy holy hill? He that walketh uprightly, and worketh righteousness, and speaketh the truth in his heart. He that backbiteth not with his tongue, nor doeth evil to his neighbour, nor taketh up a reproach against his neighbour. In whose eyes a vile person is contemned; but he honoureth them that fear the Lord. He that sweareth to his own hurt, and changeth not. He that putteth not out his money to usury, nor taketh reward against the innocent. He that doeth these things shall never be moved (Psalm 15:1-5).

In the The Treasury of David, Charles H. Spurgeon had this to say about Psalm 15:

Saints not only desire to love and speak truth with their lips, but they seek to be true within; they will not lie even in the closet of their hearts, for God is there to listen; they scorn double meanings, evasions, equivocations, white lies, flatteries, and deceptions. Though truths, like roses, have thorns about them, good men wear them in their bosoms. Our heart must be the sanctuary and refuge of truth, should it be banished from all the world beside, and hunted from among men; at all risk we must entertain the angel of truth, for truth is God's daughter.

Psalm 15 gives us substantive food for thought. Since truth matters so much to our Lord, I suppose He must be shaking His head quite often now as He looks down on this impious world from heaven above.