surprised this hasn't been referenced...
definitely read and ponder on the book of Proverbs in the Bible's old testament. there are even some proverbs specifically about the attainment of wisdom.
this is a goldmine even if you don't subscribe to christian theology, the book is largely secular.
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If you will not fight when your victory will be sure and not too costly, you may come to the moment when you will have to fight with all the odds against you and only a precarious chance for survival. There may even be a worse case. You may have to fight when there is no hope of victory, because it is better to perish than to live as slaves.
~ Winston Churchill
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