Every leader I know has rules for the business. Pricing rules, hiring rules, standards for the team. My code has a rule most of them are missing, and it sits at number eleven on purpose: be selfish with your own personal development.
Selfish sounds like the opposite of leadership. It is not. Here is the logic, and it has never failed me: if you cannot be great for yourself, you cannot be great for anyone. Not your family, not your team, not your customers. Everyone who depends on you is capped at the level you refuse to grow past.
Your growth is the ceiling
When the leader stops learning, the company quietly stops growing. Not that quarter, maybe, but soon, and for a long time. Your development is not a reward you earn after the work is done. It is the work. The reading, the training, the coaching, the rooms where you are not the smartest person present: that is where the next level of every business you touch gets decided.
So schedule it like revenue depends on it, because it does. Guard the hour. Spend the money. Take the course, hire the coach, get on the plane. The people counting on you are not asking for your leftovers. They are asking for your best, and your best has a price: you, getting better on purpose.
Be selfish with your development so you can be generous with everything else.