thyself

Yourself. Used as the reflexive or emphatic form of thee or thou.

A pronoun used reflexively for emphasis after, or in place of, thou: as, thou thyself shalt go (that is, thou shalt go and no other).

An emphasized form of the personal pronoun of the second person; — used as a subject commonly with thou; ; 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.

yourself (as the object of a verb or preposition or as an intensifier)