“ We men may say more, swear more; but indeed, Our shows are more than will; for still we prove Much in our vows, but little in our love. ”
 William Shakespeare, Twelfth Night (1623). copy citation

add

“She never told her love, But let concealment, like a worm i' the bud, Feed on her damask cheek: she pined in thought; And with a green and yellow melancholy, She sat like patience on a monument, Smiling at grief. Was not this love, indeed? We men may say more, swear more; but indeed, Our shows are more than will; for still we prove Much in our vows, but little in our love. DUKE. But died thy sister of her love, my boy?
VIOLA. I am all the daughters of my father's house, And all the brothers too;—and yet I know not.— Sir, shall I to this lady?
DUKE. Ay, that's the theme.” source