What are the characteristics of the human spirit?

It is not your brainpower that stamps you as a spirit, but your character—

In other words, the quality of your soul, whether good or evil is the cultivation of the love element in the soul which requires knowledge as a foundation, for love is only another form of knowledge. We love that which is true and good and pure and surely that implies a knowledge or appreciation of the objects of our love. We may love that which is base but that implies an ignorance of truth.