Learner's definition of ONESELF
1 — used as the object of a verb or preposition when one is the stated subject or is understood to be the subject
One can easily teach oneself how to sew.
It is not wrong to congratulate oneself.
when one discovers how different others are from oneself
One usually associates with people of the same age as oneself.
It is important to have good feelings about oneself.
2 — used for emphasis to refer again to the subject when one is the subject