Some quotes on simplicity from www.wired.com
Simplicity is knowing when less is too little and more is too much. simplicity = sanity -- John Maeda, MIT
simplicity is the basis of good design. Style is not about complication and excess, but about being designed around the individual -- Sara Berman, fashion designer
Simplicity involves two major processes: eliminating redundant elements and integrating things to make them flow -- Ken Okuyama, Pininfarina
Simplicity requires focusing on the similarities between entities, not the differences -- Gary Chang, Architect
Simplicity means products of the best quality displaying essential elements, but without additional ornamentation or clutter -- Peggy Fritzsche, President Radiological Society "