People tried to assure me two pregnancies were never the same.
He responds coyly, “I can assure you my intentions are strictly honorable.”
If you doubt that, I can assure you that five minutes with either lady will set you straight.
late 14c., from Old French asseurer (12c., Modern French assurer) "to reassure, calm, protect, to render sure," from Vulgar Latin *assecurar, from Latin ad- "to" (see ad-) + securus "safe, secure" (see secure (adj.)). Related: Assured; assuring.