When you trust someone, you know that they will keep their word. What God promised, He is Faithful to fulfill.
Jesus said “I will not in any way fail you/ give up on you, nor leave nor forsake you.” He will be your God, throughout your lifetime. God will give us wisdom. Trusting means relying on God’s integrity/strength/ ability/ security.
God brings us into victory. Don’t trust in your own ability. If He said, “He loves you”, that means He loves you forever.
Satan’s goal is to take away your peace. But God is Faithful, to save you from the evil one.