Every choice is very costly

• You live in a world where you must therefore make choices. You cannot avoid regret since there are opportunity costs for every choice you will make.
• Everything in life is about opportunity costs. Every time you say “yes” to a choice, you are also saying “no” to everything else you ...

Before you can become good at saying no, you have to know what you're saying yes to when you're saying no. Every opportunity that you pass with a no is really saying yes to something else. 

And if you feel like saying yes, ask for time to think about it before providing an answer. It...

• Upgrading your no doesn't mean you'll never say yes.
• It just means you default to saying no and only say yes when it really makes sense.
• To quote the investor Brent Beshore, “Saying no is so powerful because it preserves the opportunity to say yes.”