Life can only be understood backwards; but it must be lived forwards. Soren Kierkegaard
It's the soul's duty to be loyal to its own desires. It must abandon itself to its master passion. Rebecca West
The problem with marriage is that it ends every night after making love, and it must be rebuilt every morning before breakfast. Gabriel García Márquez
I have a mouth which I feed, it must speak what I please. Dutch Proverb
If a child shoots an arrow that reaches the top of a tall palm tree, then it must be that an elderly person carved the arrow for him. Nigerian Proverb
If it walks like a duck, quacks like a duck, looks like a duck, it must be a duck. Italian Proverb