If your head tells you one thing and your heart tells you another, before you do anything, you should first decide whether you have a better head or a better heart.
Marilyn vos Savant (1946 -)
Source: "Words of Women Quotations for Success," by Power Dynamics Publishing, 1997.
It is a lot easier to prove that you don't love someone than it is to prove that you do, but one of the best 'proofs' I know is the desire to devote time to the person with no expectation of any sort of compensation, including gratitude, in return.