Ever note, Lucilius, When love begins to sicken and decay It useth an enforced ceremony. There are no tricks in plain and simple faith; But hollow men, like horses hot at hand, Make gallant show and promise of their mettle; But when they should endure the bloody spur, They fall their crests, and like deceitful jades Sink in the trial.

Stockdale's edition of Shakespeare, with explanatory notes (ed. 1784)