"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.
And the publican, standing afar off, would not lift up so much as his eyes unto heaven, but smote upon his breast, saying, God be merciful to me a sinner."
Luke 18:9-13

Jesus is trying to show us the difference between the two men's attitudes:
       The Pharisee arrogantly boasting....
       The Publican humble....

True, we must stand up in our righteousness; but we shouldn't come with an arrogant attitude.

God's mercy, compassion and grace provides everything we have in Jesus Christ and we must treat His blessing as a gift.