Rambam: Blind Men and the Light of Torah

Maimonides ("Rambam"), Guide of the Perplexed III,11

Just as a blind man, because of absence of sight, does not cease stumbling; he thereby becomes wounded, and wounds others, because he has nobody to guide him on his way.

So too the various groups of men - every individual according to the extent of his ignorance - does to himself and to others, great evils, from which many individuals of the species suffer.

But through cognition of the truth (of Torah), enmity and hatred are removed, and the inflicting of harm by people on one another, is abolished.