Umberto Eco said this quote

What is love? There is nothing in the world, neither man nor Devil nor any thing, that I hold as suspect as love, for it penetrates the soul more than any other thing. Nothing exists that so fills and binds the heart as love does. Therefore, unless you have those weapons that subdue it, the soul plunges through love into an immense abyss.

~ Umberto Eco

Under torture you are as if under the dominion of those grasses that produce visions. Everything you have heard told, everything you have read returns to your mind, as if you were being transported, not toward heaven, but toward hell. Under torture you say not only what the inquisitor wants, but also what you imagine might please him, because a bond (this, truly, diabolical) is established between you and him ... These things I know, Ubertino; I also have belonged to those groups of men who believe they can produce the truth with white-hot iron. Well, let me tell you, the white heat of truth comes from another flame.

~ Umberto Eco

Thus we have on stage two men, each of whom knows nothing of what he believes the other knows, and to deceive each other reciprocally both speak in allusions, each of the two hoping (in vain) that the other holds the key to his puzzle.

~ Umberto Eco

Semiotics is in principle the discipline studying everything which can be used in order to lie. If something cannot be used to tell a lie, conversely it cannot be used to tell the truth: it cannot in fact be used to tell at all.

~ Umberto Eco