off all the things in the recent article 8 things the world's most successful people all have in common, the one that's been the hardest to adopt is the "just say no" policy.
"saying no" means, in various forms:
but on the other hand, "saying no" means "saying yes" to:
in other words, "saying no" is simply just "saying yes to focus". and focus is one of the most powerful things in productivity.