Learn To Say No Quotes by Robert A. Heinlein, John C. Maxwell, Charles Spurgeon, Jose Carreras, Elizabeth Gilbert, Peter Drucker and many others.

Learn to say No—and to be rude about it when necessary. Otherwise you will not have time to carry out your duty, or to do your own work, and certainly no time for love and happiness. The termites will nibble away your life and leave none of it for you.
Learn to say ‘no’ to the good so you can say ‘yes’ to the best.
Learn to say no; it will be of more use to you than to be able to read Latin.
When you arrive at a certain level it’s very easy to say yes: that is the moment to learn to say no.
It seems obvious that there comes period in your life when you have to learn to say no to things you don’t want to do. But the biggest trickiest lesson in holding on the stalwart committment to your creativity is learning how to say no to the things you do want to do.
Don’t take on things you don’t believe in and that you yourself are not good at. Learn to say no. Effective leaders match the objective needs of their company with the subjective competencies. As a result, they get an enormous amount of things done fast.
Learn to say no, with an eye to saying yes to something else.
Half of the troubles of this life can be traced to saying yes too quickly and not saying no soon enough.
Learn to say no in situations where saying no can be difficult, where it could mean getting fired. Say no anyway, because it could lead you to greater opportunities.
Freedom comes when you learn to let go, creation comes when you learn to say ‘no’
Learn to say no, so your yes has some oomph.
Be more concerned with being interested than being interesting.
Don’t say maybe if you want to say no.