As pronouns the difference between yourself and thyself
is that yourself
is (reflexive) your own self while thyself
is yourself (as the object of a verb or preposition or as an intensifier).
As a noun yourself
is your usual, normal, or true self.
(reflexive) Your own self (singular).
You (singular); .
- Be careful with that fire or you'll burn yourself .
- You yourself know that what you wrote was wrong.
Your usual, normal, or true self.
- After a good night's sleep you'll feel like yourself again.