How many a father have I seen,
  A sober man, among his boys,
  Whose youth was full of foolish noise,
Who wears his manhood hale and green:

And dare we to this fancy give,
  That had the wild oat not been sown,
  The soil, left barren, scarce had grown
The grain by which a man may live?

Or, if we held the doctrine sound
  For life outliving heats of youth,
  Yet who would preach it as a truth
To those that eddy round and round?

Hold thou the good: define it well:
  For fear divine Philosophy
  Should push beyond her mark, and be
Procuress to the Lords of Hell.