We are not weak if we make a proper use of those means which the God of Nature has placed in our power... the battle, sir, is not to the strong alone it is to the vigilant, the active, the brave. ↗
People repeat behaviour that leads to flooding their brains with pleasurable chemicals. The short-term reward loop acts over hours to years, and the long-term reproductive success loop over generations. ↗
Working long hours being single helps because your time is yours. Once you have a family your time isn't all yours anymore. Most of the Mac team, we were in our mid-20's, most of us were single, and we were able to essentially devote our lives to it. ↗