To Love Quotes (page 111)
love, n. A temporary insanity curable by marriage of by removal of the patient from the influences under which he/she incurred the disorder. This disease, like Caries and many other ailments, is prevalent only among civilized races living under artificial conditions; barbarous nations breathing pure air and eating simple food enjoy immunity from its ravages. It is sometimes fatal, but more frequently to the physician than the patient.
Ambrose Bierce
Love is a kind of dementia with very precise and oft-repeated clinical symptoms. You blush in each other's presence, you both hover in places where you expect the other to pass, you are both a little tongue-tied, you both laugh inexplicably and too long, you become quite nauseatingly girlish, and he becomes quite ridiculously gallant. You have also grown a little stupid.
Louis de Bernieres