what does this mean ? O_o?

[kcolin1061409]

Men can act against the knowledge of the true good; vice is voluntary. Man is responsible for his actions as the parent of them.

[The Atheist]

It's just an odd way of saying that we create our own destiny by making choices about how we act in society.

Who decides the dividing line between "good" and "vice" probably needs to be sorted out.