Robert Herrick - UPON LOVE

A crystal vial Cupid brought,
Which had a juice in it:
Of which who drank, he said, no thought
Of Love he should admit.

I, greedy of the prize, did drink,
And emptied soon the glass;
Which burnt me so, that I do think
The fire of hell it was.

Give me my earthen cups again,
The crystal I contemn,
Which, though enchased with pearls, contain
A deadly draught in them.

And thou, O Cupid! come not to
My threshold,--since I see,
For all I have, or else can do,
Thou still wilt cozen me.

Robert Herrick

http://www.poemhunter.com/poem/upon-love/