Am I my brother's keeper? That is, is it my duty and responsibility to keep someone else from going in the wrong direction (once I myself find the truth)?
All of the great teachers throughout history have animated the answer in the form of Yes!
Love thy neighbor and thy brother and sister as thyself, for your neighbor and your brother and sister, and in fact every single other born person has the same "inner Self" as you have.
The inner SELF is the holy-SELF, the holy spirit, the real you, it is the same in each person but it manifests in its own unique spiritual way.
When SOCRATES experienced SPIRITUAL-SELF-REALIZATION (spiritual Enlightenment), he knew without any doubt that he should attend to the natural spiritual development of all others.