There are two things parents should give their children roots and wings. Roots to give them bearing and a sense of belonging, but also wings to help free them from constraints and prejudices and give them other ways to travel (or rather, to fly).
Men's prejudices rest upon their character for the time being and cannot be overcome, as being part and parcel of themselves. Neither evidence nor common sense nor reason has the slightest influence upon them.
The most damaging prejudice consists of banning any kind of investigation of nature.
Mathematics can remove no prejudices and soften no obduracy. It has no influence in sweetening the bitter strife of parties, and in the moral world generally its action is perfectly null.
He who has a task to perform must know how to take sides, or he is quite unworthy of it.
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