Hmm, but isn't it the beginning of wisdom? Will a person be motivated to cultivate themselves to be good if they really have no inkling about their capacity to do evil and harm?
_barely_ here embodies imo the difference between knowing theoretically "yeah I can do some bad sometimes", and really feeling it in your guts, or your heart, rather than your head.
Wisdom comes when feeling who you are, not having some distant idea about who you are