Every day things happen in the world that cannot be explained by any law of things we know. Every day they're mentioned and forgotten, and the same mystery that brought them takes them away, transforming their secret into oblivion. Such is the law by which things that can't be explained must be forgotten. The visible world goes on as usual in the broad daylight. Otherness watches us from the shadows.

That, what we cannot describe mathematically cannot have a recognizable existence.

There's no way to know what makes one thing happen and not another. What leads to what. What destroys what. What causes what to flourish or die or take another course.

It is not possible to produce a set of rules purporting to describe what a man should do in every conceivable set of circumstances.

what reason did not dictate, reason cannot explain.

Although people cannot define existence and do use the term with some looseness, yet it is possible to give an extensive definition by pointing to the sorts of things that everyone believes to exist. It is still easier to point to the sort of entities that people agree in believing not to exist, and happily, this is really what concerns us most. People mean by saying that causation only applies to things that exist that it applies, if at all, to what can change; and they believe that, if anything can change, it is things like chairs and tables and minds, and not those like the propositions of Euclid and the multiplication table. What would be agreed then is that, if causal laws apply to anything it is to what can change in so far as it changes.

The complexities of cause and effect defy analysis.

Some things are just too unjust for words, and too ambiguous for either speech or ideas.

You can't ever tell what's going to hurt people.

we cannot think of any object apart from the possibility of its connexion with other things.

Much of life can never be explained but only witnessed.

My feelings can perhaps be imagined, but they can hardly be described.

It is impossible to say just what I mean!

Now, to take that which has caused us to create the world, and include it within the world we have created, is clearly impossible. That is why Quality cannot be defined. If we do define it we are defining something less than Quality itself.