On the other hand, the person who has upon him the constant demand to

meet new situations or do better in old ones will keep on enriching his
old concepts and forming new ones, or else, unable to do this, he will
fail in his position
On the other hand, the person who has upon him the constant demand to
meet new situations or do better in old ones will keep on enriching his
old concepts and forming new ones, or else, unable to do this, he will
fail in his position. And the person who keeps on steadily enriching his
concepts has discovered the secret of perpetual youth so far as his
mental life is concerned. For him there is no old age; his thought will
be always fresh, his experience always accumulating, and his knowledge
growing more valuable and usable.


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a systematic glioblastoma multiforme brain and spinal cord tumors that is a brain tumor consortium 2
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