Hebrews 11:1 "This is what it means to trust God. We will be sure about the things that we hope for. We will be sure in our minds about things that we cannot even see."
Our faith is in the character. It's in the goodness, the love, the faithfulness of God.
Think of what God has done for you already, what he's done for your friends, for your family, and your faith will soar. Faith thanks God for the victory. Before we see the answer, let your faith in God's goodness, His love for you and his power give you faith. Your faith is based on God's character, not necessarily the specific result you desire.
Remind yourself that you're not fighting this battle alone. Holy Spirit. God Himself lives in you, and he's there to strengthen and to help you in all your battles. No devil could ever wear down or wear out Holy Spirit.
1 John 4:4 says, "My dear children, you belong to God, so you have defeated them, because God's spirit who is in you, is greater than the devil who is in the world."