0 = 0 + 0 + 0 + ... = (1 - 1) + (1 - 1) + (1 - 1) + ... = 1 - 1 + 1 - 1 + 1 - 1 + ... = 1 + (-1 + 1) + (-1 + 1) + (-1 + 1) + ... = 1 + 0 + 0 + 0 + ... = 1
Ubaldus, a Catholic Saint, felt that this proved the existence of God because "something has been created out of nothing."