“When you first loved and the feeling was returned, you thought it would last forever; but it ended and you acquired knowledge of one of life’s significant lessons; the next time you loved, you did so with caution.”
2001
Related quotes

“One of the most beautiful declarations of love: i would love to have you in my life forever.”
Original: Una delle più belle dichiarazioni d'amore: mi piacerebbe averti per sempre nella mia vita.
Source: prevale.net

Vol. XI, p. 288
Posthumous publications, The Collected Works
Context: We know only fragmentarily this extraordinary thing called life; we have never looked at sorrow, except through the screen of escapes; we have never seen the beauty, the immensity of death, and we know it only through fear and sadness. There can be understanding of life, and of the significance and beauty of death, only when the mind on the instant perceives “what is”. You know, sirs, although we differentiate them, love, death, and sorrow are all the same; because, surely, love, death, and sorrow are the unknowable. The moment you know love, you have ceased to love. Love is beyond time; it has no beginning and no end, whereas knowledge has; and when you say, “I know what love is”, you don’t. You know only a sensation, a stimulus. You know the reaction to love, but that reaction is not love. In the same way, you don’t know what death is. You know only the reactions to death, and you will discover the full depth and significance of death only when the reactions have ceased.

“When was the last time you did something for the first time?”

“You fall in and out of love, but when you really love someone… it's forever.”
Source: Wedding Night