We must learn.

It is also good to love: because love is difficult. For one human being to love another human being: that is perhaps the most difficult task that has been entrusted to us, the ultimate task, the final test and proof, the work for which all other work is merely preparation. That is why young people, who are beginners in everything, are not yet capable of love: it is something they must learn. With their whole being, with all their forces, gathered around their solitary, anxious, upward-beating heart, they must learn to love. But learning-time is always a long, secluded time, and therefore loving, for a long time ahead and far on into life, is: solitude, a heightened and deepened kind of aloneness for the person who loves. 

- Letters to a young poet 

Rilke

“Break off my arms, and I will hold you
with my heart as if it were a hand;
strangle my heart, and my brain will still throb;
and should you set fire to my brain,
I still can carry you with my blood.”
                                                             - Rainer Maria Rilke

Rainer Maria Rilke

"For one human being to love another; that is perhaps the most difficult of all our tasks... The work for which all other work is but preparation."