You mustn’t believe everything you see. The image of reality we perceive with our eyes is only an illusion, an optical effect. Light is a great liar.
The time comes when each one of us has to give up as illusions the expectations which, in his youth, he pinned upon his fellow men, and when he may learn how much difficulty and pain has been added to his life by their ill-will.
Religion is an illusion and it derives its strength from its readiness to fit in with our instinctual wishful impulses.
No, our science is no illusion. But an illusion it would be to suppose that what science cannot give us we can get elsewhere.
Don’t part with your illusions. When they are gone you may still exist, but you have ceased to live.