Nietzsche characterized Christianity as, in its essence, a "slave" morality. It was born, as one scholar has written, in the "bottled up resentment that the oppressed feels towards their oppressor." For Nietzsche, Christianity imparts in people a spirit of asceticism, in which people practice self-denial and spurn creativity out of a belief that these things are sinful—and in Christianity it is sin, after all, that justifies God's judgment on people. Therefore, it causes the oppressed to blame themselves for their own oppression and demands that they solemnly accept their situation. The effect of this, Nietzsche argues, is mediocrity and a general fear on the part of people to live their lives to the fullest. This is especially true in art and literature, which are Nietzsche's primary concerns. Christian morality was thus born in resentment and hatred born out of slavery, turned inward by the enslaved themselves, leading to a new and even more insidious form of oppression. To remove oneself from this oppression, Nietzsche claimed, was to be a "free spirit" that said "yes to life."