St Augustine

Once for all, then, a short precept is given you: Love, and do what you will: whether you hold your peace, through love hold your peace; whether you cry out, through love cry out; whether you correct, through love correct; whether you spare, through love do you spare: let the root of love be within, of this root can nothing spring but what is good.

H. Browne. “Translation of Augustine’s Homily 7 on the First Epistle of John” In Philip Schaff, Ed., From Nicene and Post-Nicene Fathers, First Series, Vol. 7. (1888)