And he spake this parable unto certain which trusted in themselves that they were righteous, and despised others: Two men went up into the temple to pray; the one a Pharisee, and the other a publican. The Pharisee stood and prayed thus with himself, God, I thank thee, that I am not as other men are, extortioners, unjust, adulterers, or even as this publican. I fast twice in the week, I give tithes of all that I possess.
Luke 18:9-12
The people in Jesus' day were just like the people in our day. There were some who trusted in God and depended on Him, and there were others who instead relied on their own strength and effort. Ever since the Garden of Eden, Satan has been tempting people to seek equality with God on their own terms. We find it very easy to believe the best about ourselves and to trust that whatever we are doing is the right thing. We find it easy to give ourselves the benefit of the doubt, even when we should not. The standard of right and wrong, however, is not set by what we believe or trust, but by what God has said.
On that scale, none of us have any reason to trust in ourselves. Jeremiah reminds us, “O LORD, I know that the way of man is not in himself: it is not in man that walketh to direct his steps” (Jeremiah 10:23). And the psalmist wrote, “It is better to trust in the LORD than to put confidence in man” (Psalm 118:8), which applies to us internally as much as it does other people. If we trust in God, He will never fail, but if we trust in ourselves, we will certainly be disappointed. We have a Father in Heaven who never fails. He never lies. He never changes. He is trustworthy. The source of our hope and confidence and expectation must be in Him.