We have to cross the infinite thickness of time and space – and God has to do it first, because he comes to us first. Of the links between God and man, love is the greatest. It is as great as the distance to be crossed. So that the love may be as great as possible, the distance is as great as possible. That is why evil can extend to the extreme limit beyond which the very possibility of good disappears. Evil is permitted to touch this limit. It sometimes seems as though it overpassed it.
Source: Gravity and Grace