Remember that there is God inside your heart, as well as in the hearts of all rest. He hears and sees all things. Do you not say, "My head, my hands, my eye, my mind, my idea." Now, who is this ‘I’, that owns the body, the mind, and the brain? That ‘I’ is the spark of God that is in you. That spark is in every one. So, when you use harsh, cruel, angry, foul words against another, the God in you and the God in the other person is hurt. The tongue is a tool. You can harm yourself and harm others with it. So, be very careful; use it only for your good and the good of others. If you use it for talking kind words, for repeating the name of God or singing His Glory, or praying to Him - then, it is put to the best use.

- Divine Discourse, May16th 1969.