In short: DECIDE to work. Just do it.

For those lacking the relative self-discipline, this is like asking someone to lift a box that's too heavy for them. It's exactly the same as telling an obese person to just stop eating so much. If someone has the self-discipline, it can be helpful advice in certain circumstances. If they don't, all the advice leads to is cycles of guilt and frustration.

(I don't mean to say Eliezer has no self-discipline. What he's trying to do requires huge reserves of it.)