To will what he can do; for since 'tis vain
To will what can't be compassed, to abstain
From idle wishing is philosophy.
Lo, all our happiness and grief imply
Knowledge or not of will's ability:
They therefore can, who will what ought to be.
Nor wrest true reason from her seat awry.
Nor what a man can, should he always will:
Oft seemeth sweet what after is not so;
And what I wished, when had, hath cost a tear.