what your heart most desires translation

[olirichards]

Hi All,
I'm writing a book and I need help translating the following into Latin, preferably Latin used in England in the circa 5th century by the church:

Press what your heart most desires

I know it's oddly phrased (hence my problem), but it's a riddle, the hero has to press the letters of an inscription in that corresponds to what his heart most desires.

Thanks for your help, that's fantastic of you,
Oli