Nature

Nature is the quality of the plant, the quality of the animal, and the quality of man. Man’s life behaves according to definite method; so does his mind. Thoughts do not just happen; there is a certain method in their rise, existence, and fall. In other words, just as external phenomena are bound by law, internal phenomena, that is to say, the life and the mind of man are also bound by the law.

This mind is like a lake, and every thought is like a wave upon that lake. Just as the lake-waves rise and then fall down and disappear, so these thought-waves are continually rising in the mind-stuff and then disappearing, but they do not disappear forever. They become finer and finer, but they are there, ready to start up another time when called upon to do so. Memory is simply calling back into wave-form some of these thoughts which have gone into that finer state of existence. Thus, everything that we have thought, every action that we have done, is lodged in the mind; it is all there in fine form, and when a man dies, the sum total of these impressions and the fine body, passes out, and the destiny of the soul is guided by the resultant of all the different forces represented by the different impressions.

- Vivekananda

Love quotes, inspirational quotes and life sayings are all the result of life stories.  If you have a good love story, you can probably write a good quote out of the experience.  Think of all your best school stories, wedding night stories, romance and other survival stories for inspiration.