A much shorter speech than the ones I have listed so far, but so much truth in it, from the 1994 movie Don Juan DeMarco.
Don Juan: There are only four questions of value in life, Don Octavio.
What is sacred?
Of what is the spirit made?
What is worth living for,
and what is worth dying for?
The answer to each is the same: only love.
Delivered by the remarkable Johnny Depp before he put on the eye shadow, no wait he had on eye shadow in this movie as well (about one hour and twenty minutes into the movie).
From IMDB: Dr Jack Mickler, a psychiatrist, is only 10 days away from his retirement. A week before he is due to leave, he encounters a young man who attempts suicide- would be a pretty straightforward case except the young man claims to be Don Juan, the fabled Spanish nobleman and world renowned seducer/lover of woman. Despite original hostility from his coworkers Jack manages to persuade his associates to put the boy in his care for 10 days after which the boy will undergo an evaluation to be either released from psychiatric care or sent to a mental institution. However, as the 10 days progresses Dr Mickler and the other staff become gradually drawn into to the young man’s exotic world of love, passion and pleasure as he recounts his story to them. Whilst doing so the man’s philosophies and zeal for life and love begins to revive Dr Mickler’s somewhat passionless relationship with his wife, Marilyn as well as challenging his own views and ethics to the point where both he and the audience begin to question: could this young man truly be Don Juan?