One does not read in the Gospel that the Lord said: 'I will send you the Paraclete who will teach you about the course of the sun and moon.' For He willed to make them Christians, not mathematicians.

Love the sinner and hate the sin (Cum dilectione hominum et odio vitiorum) (Opera Omnia, vol II. col. 962, letter 211.)

Singing is loving. (Cantare Amantis est)

For if a thing is not diminished by being shared with others, it is not rightly owned if it is only owned and not shared.