Love shows itself more in adversity than in prosperity; as light does, which shines most where the place is darkest.
Leonardo da VinciGreat love is born of great knowledge of the thing that is loved, and if you do not know it, you can love it little or not at all.
Leonardo da VinciA bird is an instrument working according to mathematical law, which instrument it is within the capacity of man to reproduce with all its movements, but not with a corresponding degree of strength, though it is deficient only in the power of maintaining equilibrium. We may therefore say that such an instrument constructed by man is lacking in nothing except the life of the bird, and this life must needs be supplied from that of man.
Leonardo da Vinci