Sin.

Sin never slew a soul unless there went
Along with it some tempting blandishment.

Sin once reached up to God's eternal sphere,
And was committed, not remitted there.

There's no constraint to do amiss,
Whereas but one enforcement is.

Evil no nature hath; the loss of good
Is that which gives to sin a livelihood.

There is no evil that we do commit,
But hath th' extraction of some good from it:
As when we sin, God, the great Chemist, thence
Draws out th' elixir of true penitence.

Sin is an act so free, that if we shall
Say 'tis not free, 'tis then no sin at all.