What is love

Good shephard, tell this youth what 'tis to love.
It is to be all made of sighs and tears,
...
It is to be all made of faith and service,
...
It is to be all made of fantasy,
...
All adoration, duty, and observance,
All humbleness, all patience, and impatience,
All purity, all trial, all observance.

- Shakespeare's As You Like It.