I have never done disreputable things in my life.
我一生没做过见不得人的事。
You should never do shady things that you are afraid of being exposed.
凡是怕人知道的事就不该做,
And you should not be afraid of being known about things you do.
应该做的事就不怕人知道,
What’s more, the more people know about it,
the more it seems that those things should be done.
甚或知道的人越多越显得这事该做。