The test of the machine is the satisfaction it gives you. There isn’t any other test. If the machine produces tranquility it’s right. If it disturbs you it’s wrong until either the machine or your mind is changed.
Robert M. Pirsig (1928–2017) was an American author and professor. Pirsig was best known for his book Zen and the Art of Motorcycle Maintenance, a contemporary philosophical meditation on how to live.