"You therefore must be perfect, as your heavenly Father is perfect."
Matthew 5:48
"None is righteous, no not one. No one understands, no one seeks for God. All have turned aside; together they have become worthless. No one does good, not even one."
Romans 3:10-12
"To the one who works, his wages are not counted as a gift, but as his due. But, to the one who does not work, but trusts Him who justifies the ungodly, his faith is counted as righteousness."
Romans 4:4-5

(from pe.com)
Secondly, I had the privilege this morning of telling the story of Jesus' birth to the elementary students at my church and explaining why it is such good news. I told them that even Jesus' name means something! His name is translated from Hebrew and means "God saves." When I embrace a "works mindset," believing I somehow receive blessings from God because I have done enough good things, God no longer saves. God gives me my wage, my earnings, my merit badge. That doesn't even fit with his name! I don't know how to say "God pins badge" in Hebrew, but it's not "Jesus."

(from melrosetroop68.org)
Thirdly, during the praise music at church this morning, we read the following verse out loud together:
"Behold, the days are coming, declares the LORD, when I will raise up for David a righteous Branch, and he shall reign as king and deal wisely, and shall execute justice and righteousness in the land. In his days Judah will be saved, and Israel will dwell securely. And this is the name by which he will be called: 'The LORD is our righteousness.'"
Jeremiah 23:5-6
This is a prophecy about Jesus, and it tells us of another well-suited name for my Savior, a name which I very seldom hear mentioned. "The LORD is our righteousness." This is the essence of the gospel, the good news of Jesus. Because of my utter failure to conform to God's perfect law, Jesus did it for me and offers me his record.
The point is this: In thinking about my standing before God, I often want to subtly mix in one teaspoon of trust in my own efforts and achievements. Instead, I will, and I must continuously decide to accept Jesus' offer, his penalty paid in my place, and his perfect record substituted for mine. From this kind of trust flows all my freedom to love God and run in the path of his commands. When I realize how much I've been rescued from, I am grateful to God and want to love others in the same way. When I deceive myself into believing that I earned what I have, I swell up with pride, wait for others to pat me on the back, and I sit on my pompous butt.

(from frealfitness.com)