Sans les mathématiques on ne pénètre point au fond de la philosophie. Sans la philosophie on ne pénètre point au fond des mathématiques. Sans les deux on ne pénètre au fond de rien. — Leibniz [Without mathematics we cannot penetrate deeply into philosophy. Without philosophy we cannot penetrate deeply into mathematics. Without both we cannot penetrate deeply into anything.]
(From Chaitin’s home page:
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What did “philosophie” mean in Leibniz’s time? (For Newton, e.g., “natural philosophy” was the usual term for what we now call “physics”.)