When we consider that Christ is the true light, we learn that our own life also must shine with the rays of that true light. Now these rays of the Sun of Justice are the virtues which pour out to enlighten us. If we truly think of Christ as our source of holiness, we shall refrain from anything wicked or impure in thought or act and thus show ourselves to be worthy bearers of his name. For the quality of holiness is shown not by what we say but by what we do in life.
— Saint Gregory of Nyssa (c. 335 – c. 395)