He who does not understand that a dead lion is more alive than a living dog will remain a dog.
MaimonidesWhile one man can discover a certain thing by himself, another is never able to understand it, even if taught by means of all possible expressions and metaphors, and during a long period; his mind can in no way grasp it, his capacity is insufficient for it.
MaimonidesThe same is the case with those opinions of man to which he has been accustomed from his youth; he likes them, defends them, and shuns the opposite views.
MaimonidesOne should see the world, and see himself as a scale with an equal balance of good and evil. When he does one good deed the scale is tipped to the good - he and the world is saved. When he does one evil deed the scale is tipped to the bad - he and the world is destroyed.
Maimonides