Nothing is in vain or a waste. The Lord will redeem everything. His promise in Romans 8:28 is that He will work it all for our good. Thoughts that bring doubt, fears, unbelief are lies. I have a mentee whose faith was shaken because she embraced thoughts causing stark fear ~ paralyzed in her tracks.
2 Timothy 1:7 says that fear is a spirit. Fear is a tormentor, designed to waylay us in our progressive sanctification journey. Renounce the fear and affirm the rest of the verse. It says, “…but of power and of love and of a sound mind.” The Greek definitions for a sound mind are: good judgment, disciplined thought patterns, and the ability to understand and make right decisions.
Our trials are essential in our spiritual growth. The Lord uses them to strengthen our faith. When the fiery dart lies come, we must hold up our door shield of faith to quench them ~ remaining steadfast and immovable.