"He who knows and knows that he knows is wise, follow him. He who knows and knows not that he knows is asleep, wake him. He who knows not and knows that he knows not is a child., teach him. He who ...
Worth noting: though the validity of he don’t in various dialects is debatable, I’ve yet to come across a dialect in which he doesn’t isn’t considered correct. In other words, as a non-native speaker it is always safest to err on the side of caution and use he doesn’t. Speakers of ‘don’t dialects’ might possibly find it a tad uppity or overly formal—but not incorrect.
Which you use is a matter of preference, each with its relative merits and issues: "he or she" is unlikely to upset anybody for violating either their ideologies or belief in Victorian grammar, but it's a bit long-winded; "he", using the masculine form as 'default' when the gender is unknown, has plenty of counterparts in plenty of languages, but feminists may get upset that you're not ...
32 He doesn't is correct, because it is the contraction of He does not. He don't is incorrect, because it it the contraction of He do not. Subject-Verb agreement requires that he goes with does. He don't, however, is slang and certainly used in many places, but you would never see it in professional writing, because of Subject-Verb agreement.
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