No one ever became thoroughly bad in one step.
There is great unanimity among the dissolute. [Lat., Magna inter molles concordia.]
Whatever guilt is perpetrated by some evil prompting, is grievous to the author of the crime. This is the first punishment of guilt that no one who is guilty is acquitted at the judgment seat of his own conscience.
No one ever reached the worst of a vice at one leap
No man ever became very wicked all at once.