Georges CLEMENCEAU: (…) so many worries from which Durand-Ruel spared Monet, allowed Monet to be and remain himself despite all the undistinguished conspiracies!
All thanks to Paul Durand-Ruel. 

Eugène BOUDIN to Durand-Ruel: Deauville, 2nd October 1885: (…) I would be so happy to see you overcome your difficulties and bring the hard venture you have undertaken to a successful end, which is to bring new talents to light and make the harsh public appreciate our art. We would all be very ungrateful to fail to recognize the services you render to us and the efforts you attempt for our common interest.

Claude MONET recognizes towards the end of his life: (…) There is only one person to whom I owe something; it is to Durand-Ruel who was described as a crazy man and because of us was almost ruined. (…)

Claude MONET, the last of the great Impressionist artists still alive, wrote to Paul’s eldest son, Joseph upon learning of the dealer's passing: My dear Friend, allow me to express the great sadness which I share with you; I cannot forget all that my friends and I particularly owe to your dear father. (…)

Camille PISSARRO, wrote to his niece Esther Isaacson, from Paris, on 4th January 1881: (…) Durand-Ruel, one of the great Parisian art-dealers, came to see me and has taken a great part of my pictures and watercolours, and has proposed to buy every work of art that I will create. It brings peace of mind for some time and the means to create important art pieces. 

Auguste RENOIR, one of Paul Durand-Ruel’s closest friends, writes to him in November 1885: (…) Whatever they [the public, press and dealers] do, they will not kill your true quality: the love of the art and the defence of the artists before their death.  In the future, this will be your legacy.