Charles H. Spurgeon on Psalms 119:168

All my ways are before thee. That God seeth the secrets of our heart, is a point terrible to the wicked but joyful to the godly. The wicked are sorry that their heart is so open: it is a boiling pot of all mischief, a furnace and forge house for evil. It grieveth them that man should hear and see their words and actions; but what a terror is this that their Judge, whom they hate, seeth their thought! If they could deny this, they would. But so many of them as are convinced and forced to acknowledge a God, are shaken betimes with this also that he is All seeing. Others proceed more summarily, and at once deny the Godhead in their heart, and so destroy this conscience of his All knowledge. But it is in vain: the more they harden their heart by this godless thought, the more fear is in them; while they choke and check their conscience that it crow not against them it checks them with foresight of fearful vengeance and for the present convinceth them of the omniscience of God, the more they press to suppress it. But the godly rejoice herein; it is to them a rule to square their thoughts by; they take no liberty of evil thinking, willing, wishing, or affecting, in their hearts. Where that candle shineth, all things are framed as worthy of him and of his sight, whom they know to be seeing their heart. William Struther, 1633.