All truth, in the long run, is only common sense clarified.
— Thomas Henry Huxley

Ignorance is the first requisite of the historian -- ignorance, which simplifies and clarifies, which selects and omits, with a placid perfection unattainable by the highest art.
Lytton Strachey clarify quote

A scientist's aim in a discussion with his colleagues is not to persuade, but to clarify.
— Leo Szilard

The Presidency is not merely an administrative office. Thats the least of it. It is more than an engineering job, efficient or inefficient. It is pre-eminently a place of moral leadership. All our great Presidents were leaders of thought at times when certain historic ideas in the life of the nation had to be clarified.
— Franklin D. Roosevelt

Matisse makes a drawing, then he makes a copy of it. He recopies it five times, ten times, always clarifying the line. He's convinced that the last, the most stripped down, is the best, the purest, the definitive one; and in fact, most of the time, it was the first. In drawing, nothing is better than the first attempt.
— clarify quotation by Pablo Picasso