Ephesians 2:3 among whom also we all once conducted ourselves in the lusts of our flesh, fulfilling the desires of the flesh and of the mind, and were by nature children of wrath, just as the others.
No matter how perfect we think we are there are always things which we can find wrong with ourselves or with others.
We were probably blissfully unaware we were that bad before God opened our eyes to how much we were doing things wrong; we may well have been simply doing what we thought was right at the time, but that did not make it right!
The most amazing thing to me is that God continues to love us even after we have messed things up good and proper!