Webster's Revised Unabridged Dictionary · 1913

Yourself

Yourself , pronoun

[Your + self.]

An emphasized or reflexive form of the pronoun of the second person; -- used as a subject commonly with you; as, you yourself shall see it; also, alone in the predicate, either in the nominative or objective case; as, you have injured yourself.
Of which right now ye han yourselve heard. — Chaucer
If yourselves are old, make it your cause. — Shakespeare
Why should you be so cruel to yourself? — Milton
The religious movement which you yourself, as well as I, so faithfully followed from first to last. — J. H. Newman