Think about it.
Does Grady Booch (builder of yesterday's, now forgotten methodology) have some kind of special wisdom to dispense? If not why does Kent Beck? "Mastering" Programming, heh.
That said, sure no one can argue against such 'motherhood and applepie' statements at such a high level of abstraction.
Here is one from me "Think about what you do and act accordingly". you are saying "well duh?"? Exactly my reaction to this pablum.
Not sure any of these aphorisms are particularly relevant in practical work. Still, whatever makes people happy. If you find these useful, good for you.
[1] Not ignoring his work on JUnit which I used extensively when I used to work in Java. Of all the agile gurus, I respect Kent the most, because he has actually written useful code. Just playing devil's advocate a bit..