Chazal say that people who prepare on erev Shabbos…
Chazal say that people who prepare on erev Shabbos for Shabbos will have what to eat on Shabbos. This is a very simple premise. The same thing is true when you prepare for anything. That includes olam haba.
— from Decisions & Choices (Decision/Choice/Focus/Forethought/Consequences)
In the book
Think the consequences through before you act, the good and the bad alike — and never dismiss the small inputs, because, as Bruce Barton said, when you consider what enormous consequences flow from little things, you begin to suspect there are no little things at all. Prepare in advance, because the one who readies himself before the storm is the one who has what he needs when it comes. And once a decision is in motion, score it honestly along the way: a poor result should send you back to ask whether the objective is even still worth pursuing, and if so, what to change. — Decisions & Choices (Decision/Choice/Focus/Forethought/Consequences)