“Nothing is stronger than habit.”
Nil adsuetudine maius.
Ovid book Ars amatoria
Variant translation: Nothing is more powerful than custom.
Book II, line 345
Ars Amatoria (The Art of Love)

The Ars amatoria is an instructional elegy series in three books by the ancient Roman poet Ovid. It was written in 2 CE.
“Nothing is stronger than habit.”
Nil adsuetudine maius.
Ovid book Ars amatoria
Variant translation: Nothing is more powerful than custom.
Book II, line 345
Ars Amatoria (The Art of Love)
“If you would be loved, be lovable”
Ut ameris, amabilis esto.
Ovid book Ars amatoria
Variant translation: To be loved, be lovable.
Book II, line 107
Compare: Si vis amari, ama. ("If you wish to be loved, love"), attributed to Hecato by Seneca the Younger in Epistulae Morales ad Lucilium, Epistle IX
Ars Amatoria (The Art of Love)
Variant: If you want to be loved, be lovable.