Two loves I have, of comfort and despair,
Which like two spirits do suggest me still:
The better angel is a man right fair,
The worser spirit a woman coloured ill.
To win me soon to hell, my female evil
Tempteth my better angel from my side,
And would corrupt my saint to be a devil,
Wooing his purity with her foul pride.
And whether that my angel be turned fiend,
Suspect I may, yet not directly tell;
But being both from me both to each friend,
I guess one angel in another's hell.
Yet this shall I ne'er know, but live in doubt,
Till my bad angel fire my good one out.
William Shakespeare
http://www.poemhunter.com/poem/sonnet-144-two-loves-i-have-of-comfort-and-despa/