There are in every man, always, two simultaneous allegiances, one to God, the other to Satan. Invocation of God, or Spirituality, is a desire to climb higher; that of Satan, or animality, is delight in descent.
The chief assertion of religious morality is that white is a color. Virtue is not the absence of vices or the avoidance of moral dangers; virtue is a vivid and separate thing, like pain or a particular smell.
You are a man, not God; you are human, not an angel. How can you expect to remain always in a constant state of virtue, when this was not possible even for an angel of Heaven, nor for the first man in the Garden?