I ought not to doubt the steadiness of your affection. Yet such is the inconsistency of real love, that it is always awake to suspicion, however unreasonable; always requiring new assurances from the object of its interest, and thus it is, that i always feel revived, as by a new convinction, when your words tell me I am dear to you; and wanting these, I relapse into doubt and often into despondency.
The Mysteries of Udolfo: A Romance Interspersed with Some Pieces of Poetry (ed. 1795)