midlife

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If your study takes you to the (7) ______ of understanding of a subject and, you have reached so far, you find that you can penetrate to (8) ______ no one has been before, you experience an exhilaration which can’t be denied and which (9) _____ you to a life of research.

At first this may require an effort of (3) ______ and a period of self-discipline.