There is a difference in knowing God and knowing about God. Most people know about God from things they have observed or heard. Your parents may have talked to you about God. You may attend church and hear sermons about God. However, knowing about God is not knowing God.
Know God by faith. He who comes to God must believe (Hebrews 11:6). You cannot come to God any other way. Because God is Spirit, you cannot see Him with your eyes (John 4:24). Only faith can usher you into the presence of God.
Know God in your heart. The word heart refers to your mind, will, and emotions. God changes our hearts through the gospel of Jesus Christ, enabling your faith to know God the Father through the Son (John 14:6). You know God by looking unto Jesus, the author and finisher of our faith (Hebrews 12:2).
Know God in a personal relationship. You walk with God by faith. For we walk by faith, not by sight (2 Corinthians 5:7). Faith is assurance that God is with you, and all the time. Faith is assurance that God hears your prayers. Faith is the evidence. When you know God, faith is the evidence of things not seen (Hebrews 11:1).