“Being immersed in the commercial world constrains the mind, limiting it to conventional, acceptable thought; it is hard to close a sale if we pause in the proceedings to meditate at length about a man’s relation to the cosmos.”

-Daniel Klein, “Travels with Epicurus” – terrific book on aging well and gracefully with purpose, through the ruminations of an old man dawdling through the timeless philosophy of the wise.  You can get the book on Amazon.