one·self /ˌwʌnˈsɛlf/ pronoun
— 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.
— used for emphasis to refer again to the subject when one is the subject ▪ If one does not have the information oneself, one can ask others.