The Rebbe spoke about the suffering in the world, and when he came to these words, began to choke and sob:

If He is capable of anything,
why can’t He provide good without the bad?

And if His Torah answers all questions, why does it not answer this?

There could be only one answer:

He does not wish us to know,
because if we knew
we might consent
and let such a world be.

Hoshanah Rabbah 5743.