A wise man is not grave but he appears so because he is not shallow. He does not laugh, his laughter is not that of a shallow man. At the most he smiles – even that is too much. In fact he need not even smile because his whole being is filled with so much beauty, with so much beatitude, with so much happiness, that he need not. (...) Watch a shallow river, it makes much noise. A deep river moves as if it doesn’t move, no noise – not because it is not moving. It is moving, but it is so deep that the noise doesn’t reach you. A wise man laughs in the deepest core of his being. It doesn’t reach his lips.