There are moments when laughter must be kept back, and there are times when tears must be withheld. And those who have arrived at the stage where they can act efficiently the part that they are meant to act in this life's drama, have even power over the expression of their face; they can even turn their tears into smiles, or their smiles into tears. One may ask, is it not hypocrisy not to be natural? But he who has control over his nature is more natural; he is not only natural, he is the master of nature, while the one who lacks power over nature, in spite of his naturalness, is weak.