When we have doubts in our hearts we are bound to entertain fear. These elements of fear can be detrimental to a person's destiny. It can even lead to someone having suicidal thoughts. For the sake of our mental health It is best that we do not give in to those emotional doubts.
Rather than doing that we should cast all our fears on God. That is what the Word of God tells us. It says that we should cast all of our cares on God. Now, why did God ask us to cast our cares on Him? This is because He constantly cares for each and everyone of us.
God is highly mindful of us and everything concerning us. He does not want experience suffering. The plan that God has for us is good not evil, and to give us the expected end.
Looking at the problems which are coming to us in the world will make us feel anxious. We should not meditate upon the challenges which we are facing in our life. To be able to scare through everything without being anxious, let our eyes be upon the Lord.