“Loving someone who doesn't love me back is like loving the wind, which is felt but cannot be seen. The lover does not love the feeling of getting love in return, but sacrifices himself for his happiness.”
Original: What's your?
Related quotes

“It's okay to love someone who doesn't love you back, as long as they're worth loving.”
Variant: It's all right to love someone who doesn't love you back, as long as they're worth you loving them. As long as they deserve it.
Source: Clockwork Angel
Source: Love Warps the Mind a Little

"When the Snow Melted" http://www.wordswithoutborders.org/article.php?lab=BaJin [Hua-Hsueh Ti Jih-Tzu] (1962), as translated by Tang Sheng at Words Without Borders
Context: I felt a joy in my heart, which seemed filled with love, love for the sun, the snow, the wind and the hills, love for everything around me. It was in this mood that I walked down the snow-covered path dotted with black footprints. Further down the footprints mingled and made dirty little puddles. I picked my way over the thickest snow because I loved the crunching of snow underfoot. With the sunlight pouring down and a breeze in my face I felt that balmy spring was coming to meet me.
“The greatest thing is to have someone who loves you and—and to love in return.”
Source: Ross Poldark