Shakespeare on Signaling Commitment

Tell me your counsels, I will not disclose 'em:

I have made strong proof of my constancy,

Giving myself a voluntary wound

Here, in the thigh: can I bear that with patience.

And not my husband's secrets?

(Julius Caesar, Act 2, Scene 1, Lines 926-930)

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…prove that ever I lose more blood

with love than I will get again with drinking, pick

out mine eyes with a ballad-maker's pen and hang me

up at the door of a brothel-house for the sign of

blind Cupid.

(Much Ado About Nothing, Act 1, Scene 1, Lines 224-228)

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I will not love: if 
I do, hang me; i' faith, I will not. 

(Love's Labour's Lost, Act 4, Scene 3, Lines 1326-1327)