Deception of the Heart

The heart is deceitful above all things, and desperately wicked: who can know it? Jeremiah 17:9

There is this poem that I stumbled upon, that seems to explain quite well things I constantly deal with when I enter into relationships. All of a sudden the heart becomes blind, and you do not realize the trouble you are in and the stress and anguish it has caused; until it subsides. The following poem is worth reading to remind yourself to keep a head on your shoulders despite the luring of dumb loves pull. I can say I can testify by many experiences; many too many; that I wish this poem would have been more prevalent in my childhood instead of stories of unrealistic romances. Besides the point, I enjoy this poem, except I do not agree with the last sentence because God did give all his heart, and though we failed Him, Jesus has redeemed us and God never loses. :)

Never give all the heart, for love
Will hardly seem worth thinking of
To passionate women if it seem
Certain, and they never dream
That it fades out from kiss to kiss;
For everything that's lovely is
But a brief, dreamy, kind delight.
O never give the heart outright,
For they, for all smooth lips can say,
Have given their hearts up to the play.
And who could play it well enough
If deaf and dumb and blind with love?
He that made this knows all the cost,
For he gave all his heart and lost. 
W.B. Yeats