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Takut mencintai sama dengan takut menghadapi hidup, dan mereka yang takut pada hidup sama dengan tiga perempat mati. -Bertrand Russell.

Antara teologi dan ilmu pengetahuan terletak suatu daerah tak bertuan. Daerah ini diserang baik oleh teologi maupun oleh ilmu pengetahuan. Daerah tak bertuan ini adalah filsafat. -Bertrand Russell.

Ilmu dapat mengungkapkan apa pun yang sebenarnya sudah atau sedikit sekali kita ketahui, tapi filosofi dapat membeberkan apa pun yang sama sekali belum kita ketahui. -Bertrand Russell.

I would never die for my beliefs because I might be wrong.

Freedom of opinion can only exist when the government thinks itself secure.

All exact science is dominated by the idea of approximation.

Men fear thought as they fear nothing else on earth — more than ruin — more even than death…. Thought is subversive and revolutionary, destructive and terrible, thought is merciless to privilege, established institutions, and comfortable habit. Thought looks into the pit of hell and is not afraid. Thought is great and swift and free, the light of the world, and the chief glory of man.

Change is scientific, progress is ethical; change is indubitable, whereas progress is a matter of controversy.

To be able to fill leisure intelligently is the last product of civilization, and at present very few people have reached this level.

Many people would sooner die than think; In fact, they do so.