What "NO" really stands for.

A couple of days ago, I stumbled upon a quote that said that “FAIL" stands for "first attempt in learning," that “END” means “effort never dies,” and that when we hear “NO,” we should understand those two simple letters as “next opportunity.”
Change often seems difficult, and jumping into the next opportunity comes with a lot of insecurities; insecurities that can be so simply avoided by sticking to the familiar. Often, when I am faced with clear signs of the need to change, I ask myself how much I will miss what I have now. Then I consider how high the chances are that the “new" will be more joyful, even if just for a very short period of time.
Sometimes accepting the need for a change takes longer. But then, once one is aware of a considerable issue, one should keep questioning the status quo regularly. Whenever the pain caused by closing an old door feels unmanageable, and the issue somehow still contributes to a personal evolution, change can wait. Then there is no need to say “no” just yet. The Zen saying is that “when the student is ready, the teacher will appear.” 
I’ve come to understand that every step we take leads us to the next opportunity. As painful as change sometimes is, it’s simultaneously what keeps life exciting. And so, we should always walk forward and look for the ever-changing.