Being scared isn't a good enough reason

It’s one thing to have healthy boundaries and wise priorities. It’s something completely different to say no to God's calling because you’re afraid of it.

But Moses pleaded with the Lord, “O Lord, I’m not very good with words. I never have been, and I’m not now, even though you have spoken to me. I get tongue-tied, and my words get tangled.” (Exodus 4:10)