I read this answer to a despondent doubting brother on a forum today and loved it…It is by Oscarr in New Zealand
“The Christian life consists of faith in what God has said about you in the Bible. What would be good for you is to go through the Letters of Paul and make a list of what he says about who a Christian believer is. For example, here is a few:
A child of God
A new creation in Christ
Jesus is your brother
Seated with Jesus at the right hand of God
Part of the family of God
Totally righteous in Christ
Not under any condemnation at all
Filled with the Holy Spirit
Blessed with every spiritual blessing in heavenly places
Has all authority over the devil and his demons
Able to come boldly to the throne of grace to find mercy and grace to help in time of need
Jesus is your refuge and strength, a very present help in time of trouble
The law of the Spirit of life has set you free from the law of sin and death
Jesus has set you free from the body of death
Your sins have been removed from you as far as the east is from the west.
God has buried your sins in the deepest sea of His forgetfulness and put up a sign, “No fishing!”
These do not depend on how you feel. These are what the New Testament says about you. Regardless of how you feel, or what you sense with your five senses, these things are totally true about you. All you have to do is to believe them and start living on the foundation of your faith in what God has said about you. God is more faithful to you and you are able to be faithful to Him. He knows you better than you know yourself.
You may feel down and isolated, that it seems that dark clouds are hiding God from you. But some does that deliberately so that you will establish yourself in Him by faith and not by feelings. Once He is assured that you definitely believe what He says about you in spite of your feelings, the dark clouds will roll away and the Spirit will give you the assurance that God is truly with you and in you. This is your fight of faith. The flesh (your emotions and feelings) wars against the Spirit. You have to fight to be in the Spirit and not in the flesh.
This is what the armour of God is for, to provide you with the weapons of your warfare.
You have the helmet of salvation as a born again Christian,
You have the breastplate of the righteousness of Christ which has been given to you as a free gift from God,
You have the shield of faith to quench the fiery darts of the enemy,
You have the belt of truth – the foundation of God’s Word,
Your feet are shod with the gospel of peace.
You also have the sword of the Spirit, using the Word of God as a weapon against the doubts and fears the enemy would attack you in your mind,
You have the weapon of all-prayer, in which you can pour out your heart to God. The book of Psalms is a good guide about what to pray. Turn the psalms into your personal prayers.
These are the weapons in your fight of faith. Use them and the Scripture will become real to you – “Thank God that we always have the victory in Christ.”