Himself:
1. an emphatic appositive of him or he: He himself spoke to the men.
2. a reflexive form of him: He cut himself.
3. (used in absolute constructions): Himself the soul of honor, he included many rascals among his intimates.
4. (used as the object of a preposition or as the direct or indirect object of a verb): The old car had room only for himself and three others.
5. (used in comparisons after as or than): His wife is as stingy as himself.
6. his normal or customary self: He is himself again.
7. Irish Eng.a man of importance, esp. the master of the house: Himself will be wanting an early dinner.

Oneself:
1. a person's self (used for emphasis or reflexively): One often hurts oneself accidentally.
2. be oneself,
a. to be in one's normal state of mind or physical condition.
b. to be unaffected and sincere: One makes more friends by being oneself than by putting on airs.
3. by oneself,
a. without a companion; alone.
b. through one's own efforts; unaided: to become a millionaire by oneself.
4. come to oneself,
a. Also,come to.to regain consciousness.
b. to regain one's self-possession; come to one's senses. Also,one's' self