Some people overreact to the words “Total Depravity” thinking it means one is as bad as one can be.
And so I thought in the past.
Yet, it is difficult to avoid the force of the following verses and the direction they point us to:
“…the hearts of the children of man are full of evil, and madness is in their hearts while they live, and after that they go to the dead” (Eccl 9:3)
“The good person out of the good treasure of his heart produces good, and the evil person out of his evil treasure produces evil, for out of the abundance of the heart his mouth speaks.” (Luke 6:45)
“…All have turned aside; together they have become worthless;
no one does good,
not even one…” (Rom 3:12)
“for all have sinned and fall short from the glory of God” (Rom 3:23)
These verses teach clearly that good is not intrinsic in man. Before the Fall, man was good because God pronounced all His creation to be good. But man fell from God's glory. Man became corrupted with sin and so his offspring.
Therefore, it is not difficult then to realize that evil is only the corruption of the good -as Augustine astutely noticed it. The following illustration helped me grasp that concept.
"Behold two pieces of bread in each of my hands. One has little mold in it while the other a bit more. If I were to ask you to tell me what I'm holding in each hand, you’d likely say: 'this (or that) is a piece of moldy bread.' Therefore, you realize that it doesn’t matter how much mold any slice has, because you have rightly noticed that both are 'moldy bread'."
And so is with us.
And this is what I understand total depravity to mean: that man is a sinner no matter how much sin he carries in his being. But it doesn't mean he is as bad as he can be. Otherwise there will be a point when he would cease to be a man, like that piece of moldy bread ceasing to be bread to become just mold.