The Essays of Arthur Schopenhauer; The Art of Literature

But there is always a limit to human capacity; and no one can be a great genius without having some decidedly weak side, it may even be, some intellectual narrowness

Great, genuine and extraordinary work can be done only in so far as its author disregards the method, the thoughts, the opinions of his contemporaries, and quietly works on, in spite of their criticism, on his side despising what they praise.

It is often the case that a great mind prefers soliloquy to the dialogue he may have in this world