The difference between successful people and very successful people is that very successful people say no to almost everything. - Warren Buffet
You’ve got to keep control of your time. And you won’t keep control of your time unless you can say no. You can’t let people set your agenda in life.
We all have 24 hours in the day. We can’t save time, only spend it wisely or foolishly. And life is too short to waste, so use your time wisely - prioritise and learn to say no.