Ghosts? Pah. We are the most substantial things in the world, the foundations of the present. We are memories. Ian McDonald
This letter, if judged by the novelty and profundity of ideas it contains, is perhaps the most substantial piece of writing in the whole literature of mankind. Hermann Weyl
Delacroix was passionately in love with passion, and coldly determined to seek the means of expressing passion in the most visible manner. In this dual character, be it said in passing, we find the two distinguishing marks of the most substantial geniuses, extreme geniuses. Charles Baudelaire