The tendency to cruelty ...

The tendency to cruelty should be watched in children and if they incline to any such cruelty, they should be taught the contrary usage. For the custom of tormenting and killing other animals will, by degrees, harden their hearts even toward man. Children should from the beginning, be brought up in an abhorrence of killing or tormenting living beings.
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 John Locke

Quotes from the same author

I have always thought the actions of men the best interpreters of their thoughts.
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 John Locke
If you want to succeed you should strike out on new paths, rather than travel the worn paths of accepted success.
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 John Locke
A friendship founded on business is better than a business founded on friendship.
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 John Locke
Curiosity in children, is but an appetite for knowledge. The great reason why children abandon themselves wholly to silly pursuits and trifle away their time insipidly is, because they find their curiosity balked, and their inquiries neglected.
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 John Locke
Children should from the beginning be bred up in an abhorrence of killing or tormenting any living creature; and be taught not to spoil or destroy any thing, unless it be for the preservation or advantage of some other that is nobler.
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 John Locke