"Love why do we one passion call, When 'tis a compound of them all? Where hot and cold, where sharp and sweet, In all their equipages meet; Where pleasures mix'd with pains appear, Sorrow with joy, and hope with fear."

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A perfect life is a contradiction in terms. Life itself is a state of continuous struggle between ourselves and everything outside. Every moment we are fighting actually with external nature, and if we are defeated, our life has to go. It is, for instance, a continuous struggle for food and air. If food or air fails, we die. Life is not a simple and smoothly flowing thing, but it is a compound effect. This complex struggle between something inside and the external world is what we call life. So it is clear that when this struggle ceases, there will be an end of life.

— Swami Vivekananda