I saw that Daily gem in my inbox as well, and my thoughts were that it clarified some things for me on doubt.
The danger of doubt is doubting oneself or doubting God’s ability to show you truth or give you power.
Doubting ideas or teachings can be healthy if you doubt those teachings yet still have confidence in knowing you can find the answers and confidence there is a God wanting to show you the way. Ask and ye shall receive. Knock and it shall be opened unto you.