The inexorable decrease in kids' ranges.

If you want a smarter kid, teach your child to read as early as possible and instill in them a love for books. Because as soon as they can read, they can teach themselves.

Your children shouldn't remember you as always tired after work, too exhausted to play with them.

If you have young children, 5AM is one of the only times you can get deep work done. No one is awake, and it’s silent. And no notifications from family/friends.

Is 5AM a requirement for success? No, but that’s when I get my best work done every day.

Travel before you have kids.

The idea of spending (small amounts of) "quality time" with your kids is dangerously mistaken, because the best moments happen at completely random times. You not only can't predict them, you may not even know they've happened.