His conclusion was that ...

His conclusion was that things were not always what they appeared to be. The cub's fear of the unknown was an inherited distrust, and it had now been strengthened by experience. Thenceforth, in the nature of things, he would possess an abiding distrust of appearances.
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 Jack London

Quotes from the same author

Of her own experience she had no memory of the thing happening; but in her instinct, which was the experience of all mothers of wolves, there lurked a memory of fathers that had eaten their new-born and helpless progeny.
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 Jack London
Thus it was that in obedience to the law laid down by his mother, and in obedience to the law of that unknown and nameless thing, fear, he kept away from the mouth of the cave.
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 Jack London
This expression of abandon and surrender, of absolute trust, he reserved for the master alone.
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 Jack London
The scab is a traitor to his God, his mother, and his class.
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 Jack London
To be able to forget means sanity.
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 Jack London