And the son said to him, ‘Father, I have sinned against heaven and before you. I am no longer worthy to be called your son.’ But the father said to his servants, ‘Quickly, bring the best robe and put it on him, and put a ring on his hand, and shoes on his feet. And bring the fattened calf and kill it, and let us eat and celebrate. For this my son was dead, and is alive again; he was lost, and is found.’ And they began to celebrate. Luke 15:21-24 ESV
The son went away a prideful young man, certain in his own judgemant. He returned humbly, aware that in his sinfulness he was unworthy to be called son. But in his humility he was not too ashamed to say Father.