Tejas of the Self

There will come a time when one will have to forget all that one has learned. – Sri Ramana Maharshi

Implied meaning : To attain Self realisation one need to have only one thought and that is of God  even the subtlest thought of this illusory world can be an obstacle in the process of enlightenment, on the other hand once self realisation occurs all the imbedded sankars of previous births are burned in the tejas of the Self