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

Augustine of Hippo (354-430) Christian church father, philosopher, saint [b. Aurelius Augustinus]

Homilies on the 1st Epistle of John Tractatus in epistulam Ioannis ad Parthos], Homily 7 [tr. Browne (1888)]
    (Source)

Sermon on 1 John 4:4-12. "Love, and do what thou wilt" - Latin dilige et quod vis fac. Sometimes incorrectly given as "ama et fac quod vis." Alternate translation: "Love and then what you will, do." [tr. Fletcher]