Considered logically this concept is not identical with the totality of sense impressions referred to; but it is an arbitrary creation of the human (or animal) mind.
Concern for man and his fate must always form the chief interest of all technical endeavors. Never forget this in the midst of your diagrams and equations.
Headlines, in a way, are what mislead you because bad news is a headline, and gradual improvement is not.
I was so obsessed by this problem that I was thinking about it all the time, when I woke up in the morning, when I went to sleep at night, and that went on for eight years.
Our mind is all we’ve got. Not that it won’t lead us astray sometimes, but we still have to analyze things out within ourselves.