“There is wisdom in madness and strong probability of truth in all accusations, for people are complete and everybody is capable of everything”

About

Variant: Have I gone mad? I'm afraid so.
You're entirely Bonkers.
But I will tell you a secret,
All the best people are.
Source: Alice in Wonderland

Online interview http://www.zen-deshimaru.com/EN/sangha/deshimaru/q-r/0101.htm
Context: Religions remain what they are. Zen is meditation. Meditation is the foundation of every religion. People today feel an intense need to go back to the source of religious life, to the pure essence in the depths of themselves which they can discover only through actually experiencing it. They also need to be able to concentrate their minds in order to find the highest wisdom and freedom, which is spiritual in nature, in their efforts to deal with the influences of every description imposed upon them by their environment. Human wisdom alone is not enough, it is not complete. Only universal truth can provide the highest wisdom. Take away the word Zen and put Truth or Order of the Universe in its place.

Siddhartha (1922)
Context: Everything that is thought and expressed in words is one-sided, only half the truth; it all lacks totality, completeness, unity. When the Illustrious Buddha taught about the world, he had to divide it into Samsara and Nirvana, illusion and truth, into suffering and salvation. One cannot do otherwise, there is no other method for those who teach. But the world itself, being in and around us, is never one-sided. Never is a man or a deed wholly Samsara or wholly Nirvana; never is a man wholly a saint or a sinner. This only seems so because we suffer the illusion that time is something real.

De Abaitua interview (1998)
Context: I’ve known a lot of people go mad over the years, and it is more distressing than people dying. People dying is quite natural, people going mad is the complete antithesis of that.

Part One, Ch. 1
On the Road (1957)
Context: They danced down the streets like dingledodies, and I shambled after as I've been doing all my life after people who interest me, because the only people for me are the mad ones, the ones who are mad to live, mad to talk, mad to be saved, desirous of everything at the same time, the ones who never yawn or say a commonplace thing, but burn, burn, burn like fabulous yellow roman candles exploding like spiders across the stars and in the middle you see the blue centerlight pop and everybody goes "Awww!"

Source: Heart of Darkness

The Essays Or Counsels, Civil And Moral, Of Francis Ld. Verulam Viscount St. Albans (1625), Of Simulation And Dissimulation