The greatest obstacle to discovery is not ignorance - it is the illusion of knowledge.
— Daniel J. Boorstin

obstacles are those frightful things you see when you take your eyes off your goals.
Sydney Smith obstacles quote

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It is the constant and determined effort that breaks down resistance and sweeps away all obstacles.
— Claude M. Bristol

Obstacles cannot crush me. Every obstacle yields to stern resolve.
— Leonardo da Vinci

A human being who strives for something great considers everyone he meets on his way either as a means or as a delay and obstacle - or as a temporary resting place.
— obstacles quotation by Friedrich Nietzsche