'Away, away, your fleeting arts
May now betray some simpler hearts;
And you will smile at their believing,
And they shall weep at your deceiving.'

ANSWER TO THE FOREGOING, ADDRESSED TO MISS ---.

Dear, simple girl, those flattering arts,
From which thou'dst guard frail female hearts,
Exist but in imagination,--
Mere phantoms of thine own creation;
For he who views that witching grace,
That perfect form, that lovely face,
With eyes admiring, oh! believe me,
He never wishes to deceive thee:
Once in thy polish'd mirror glance,
Thou'lt there descry that elegance
Which from our sex demands such praises,
But envy in the other raises:
Then he who tells thee of thy beauty,
Believe me, only does his duty:
Ah! fly not from the candid youth;
It is not flattery,--'tis truth.

July 1804

George Gordon Byron

http://www.poemhunter.com/poem/lines-written-in-letters-of-an-italian-nun-and-an-english-gentleman/