What's the difference between theeself and thyself?

Theeself

Definition:

Example Sentences:

Definition:

(pron.) An emphasized form of the personal pronoun of the second person; -- used as a subject commonly with thou; as, thou thyself shalt go; that is, thou shalt go, and no other. It is sometimes used, especially in the predicate, without thou, and in the nominative as well as in the objective case.

Example Sentences:

(1) This motto--which is merely a rewording of the command to "love thy neighbor as thyself"--is compatible with man's natural structure, and although it is based on altruistic egoism, it could hardly be attacked as unethical.
(2) Reynolds doesn't particularly appreciate questions that creep into his personal life, although when I later find out that the words simply say "Know Thyself" and that the gun is in fact an old naval cannon, I wonder if he's being slightly sensitive.
(3) Critical self-reflection--the desire to know thyself, warts and all--may introduce a self-deprecating attributional bias that can undermine self-perceived altruism, even following helping for which one receives only intrinsic self-rewards.
(4) Know Thyself or Journal of Empirical Psychology (Gnothi Sauton oder Magazin zur Erfahrungsseelenkunde), 1783-1793, was the first of its kind--concentrating on nervous and mental disturbances and marking the beginning of periodical neuropsychiatric publications.