[29]
If even casual thoughts often occupy
us to such an extent that we do not see passers-by,
or even stray from our path, surely we can obtain
the same result by the exercise of our will. We
must not give way to pretexts for sloth. For unless
we make up our mind that we must be fresh, cheerful and free from all other care when we approach our
studies, we shall always find some excuse for idleness.
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