To many, total abstinence is easier than perfect moderation.
[Multi quidem facilius se abstinent ut non utantur, quam temperent ut bene utantur.]
Augustine of Hippo (354-430) Christian church father, philosopher, saint [b. Aurelius Augustinus]
On the Good of Marriage, ch. 21 (AD 401)
Variant: "Complete abstinence is easier than perfect moderation."