A thing that has no value does not exist.
The intelligence of the mind can't think of any reason to live, but it goes on anyway because the intelligence of the cells can't think of any reason to die.
Stuckness shouldn't be avoided. It's the physic predecessor of all real understanding.
Quality isn't a thing. It is an event.
Even in the presence of others he was completely alone.
The ultimate test's always your own serenity. If you don't have this when you start and maintain it while you're working you're likely to build your personal problems right into the machine itself.