"By definition, a catalogue raissonne employs methodical scholarship to gather and digest in systematic form all that can be known of an artist's work and life. In short the evidence of his intellectual and cultural life."

"I believe that one is only truly free when learning, and one can only learn when one is free."

"In our society, we don not study history to understand the process of change but just to entertain ourselve…"

"Many secrets of art and nature are thought by the unlearned to be magical."

"Barbizon Thursday, My dear Sensier: M. Letrone, whom I do not know.. ..came yesterday , and bought my _005.…"

"science is the work of the human mind, which is destined rather to study than to know, to seek the truth ra…"

"I ask you also to remember that, on this important occasion, my voice is but the feeble echo of other more …"