The reflexive case of thou, an archaic second person singular personal pronoun.
Thyself Sentence Examples
Desire nothing for thyself, seek nothing, be not anxious or envious.
Forgive thy enemy, do not avenge thyself except by doing him good.
It is, then, no longer to thyself but rather to us that thou belongest henceforth.
Their opinion and practice will be best represented in the words of one of their early teachers (quoted by Gibbon, Decline and Fall, c. 63): "When thou art alone in thy cell shut thy door, and seat thyself in a corner; raise thy mind above all things vain and transitory; recline thy beard and chin on thy breast; turn thine eyes and thy thought towards the middle of thy belly, the region of the navel (6j4 aXos); and search the place of the heart, the seat of the soul.
Acquaint thyself with a physician before thou have need of him.