Love

Whether life is or is not worth the pain of being lived, or, rather, whether it is worth the pain and the pleasure of being live depends, first and foremost on one’s capacity for love.
Happiness is to be happy in love, unhappiness is to be unhappy in love, or to have no love at all.
It is love which keeps us alive, since it alone makes life loveable. It is love which saves; it is therefore love which must be saved.
Andre Comte-Sponville , French philosopher, The Little Book of Philosophy, Vintage
Only the soul that loves is happy.
Johann Goethe , 1749-1831, German writer, Egmont
Even if I speak all the languages of men and of angels, if I don't have love, life became sounding brass, and a clanging cymbal.
Bible, Corinthians
We human beings are animals dependant on love.
Humberto Maturama, in E. Morin Method V
The poetry of life, with the love it contains and that contains it, is the only response to death.
Love makes us tolerate destiny, and makes us love life.
Love is the great poetry in the prosaic modern world.
E. Morin, French philosopher and sociologist, Method V
The two wings of our souls, immune to any gust of wind, are true love and faith.
Attributed to Stanislas-Xavier Touchet, 1848-1926, French religious
Life is sown with miracles that only people who love can wait for.
Marcel Proust, 1871-1922, French writer, In the Shadow of Young Girls in Flower
You might say that love is friendship gone mad.
Seneca , Roman philosopher and politician, Letters to Lucilius(source)[http://www.meaningsoflife.com/en/Life-Love-Quote.htm]