An excerpt from Helen Keller's wonderful The Story of My Life:
"What is love?" I asked.
She drew me closer to her and said, "It is here," pointing to my heart, whose beats I was conscious of for the first time. Her words puzzled me very much because I did not then understand anything unless I touched it.
I smelt the violets in her hand and asked, half in words, half in signs, a question which meant, "Is love the sweetness of flowers?"
"No," said my teacher.
Again I thought. The warm sun was shining on us.
"Is this not love?" I asked, pointing in the direction from which the heat came. "Is this not love?"
It seemed to me that there could be nothing more beautiful than the sun, whose warmth makes all things grow. But Miss Sullivan shook her head, and I was greatly puzzled and disappointed. I thought it strange that my teacher could not show me love.
A day or two afterward I was stringing beads of different sizes in symmetrical groups–two large beads, three small ones, and so on. I had made many mistakes, and Miss Sullivan had pointed them out again and again with gentle patience. Finally I noticed a very obvious error in the sequence and for an instant I concentrated my attention on the lesson and tried to think how I should have arranged the beads. Miss Sullivan touched my forehead and spelled with decided emphasis, "Think."
In a flash I knew that the word was the name of the process that was going on in my head. This was my first conscious perception of an abstract idea.
For a long time I was still–I was not thinking of the beads in my lap, but trying to find a meaning for "love" in the light of this new idea. The sun had been under a cloud all day, and there had been brief showers; but suddenly the sun broke forth in all its southern splendour.
Again, I asked my teacher, "Is this not love?"
"Love is something like the clouds that were in the sky before the sun came out," she replied. Then in simpler words than these, which at that time I could not have understood, she explained: "You cannot touch the clouds, you know; but you feel the rain and know how glad the flowers and the thirsty earth are to have it after a hot day. You cannot touch love either; but you feel the sweetness that it pours into everything. Without love you would not be happy or want to play."
The beautiful truth burst upon my mind–I felt that there were invisible lines stretched between my spirit and the spirits of others.