You’ve prayed the sinner’s prayer, been baptized, attend or joined in membership to a church, volunteered your service with the church, and even contributed financially to support the church, which is all fitting and right. But, Scripture is actually very specific about how to know that you know you’re a Christian. The Apostle John was inspired to write a letter or epistle dedicated to his little children about this very subject. “These things have I written unto you that believe [Greek, pisteuō] on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe [Greek, pisteuō] on the name of the Son of God” (1John 5:13 KJV).
Pisteuō can properly be translated commit, as in commitment, giving us a more forceful grasp of the meaning of this foundational, consequential, evangelical word. Commit gives us the sense we are making a long term investment in Christ, since we have counted the cost. In the KJV, in all but a handful of the 250 verses it appears in the New Testament, pisteuō is translated as some form of the word believe; in eight verses, it appears as some form of the word commit, and in three verses, it appears as trust. “For God so loved the world, that He gave His only begotten Son, that whosoever believeth [Greek, pisteuō, commits] in Him should not perish, but have everlasting life” (John 3:16).
Back to our topic of how to know that you know you’re a Christian.
Let us examine 1John 2:3-5.
2:3
“And hereby we do know that we know Him, if we keep His commandments” (1John 2:3).
Here is how we know that we know Jesus, if we presently, actively keep His commands. John plainly exhorts us to walk in present obedience, in order to know that we know Jesus.
2:4
“He that saith, I know Him, and keepeth not His commandments, is a liar, and the truth is not in him” (1John 2:4).
Just as plainly, declaring a present knowledge of Jesus, while walking in disobedience, makes one a liar. The truth cannot exist in a liar, for John further declares, “All liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death” (Revelation 21:8). This is very blunt language.
2:5
“But whoso keepeth His word, in him verily is the love of God perfected: hereby know we that we are in Him” (1John 2:5).
Truth and obedience perfect God’s love. Actively keeping God’s Word is the perfection of God’s love. This is the only means to know that we know Him and are in Him. All other methods do not represent exactly what God says about how to know that you know you’re a Christian.
Analyzing 1John 2:3-5
First, spiritual knowing and intellectual knowing are different. What your mind intellectually remembers is not necessarily the same as what you spiritually know. When God says you spiritually know something, then you know it. Otherwise, your intellectual recall of praying the sinner’s prayer, being baptized, attending or joining in membership to a church, volunteering your service with the church, and even contributing financially to support the church, all are what you intellectually know. But, walking in present tense, heart obedience to Jesus Christ is the only way to spiritually know that you know Him. “He that saith he abideth in Him ought himself also so to walk, even as He walked” (1John 2:6).
Second, everything then can be reduced to walking “in step with the Spirit” (Galatians 5:25 NIV). If we walk in step with the Spirit, then our intellectual knowledge will coincide with our spiritual knowledge. When disciples backslide into carnality, they insist their intellectual knowledge of past events is correct. This is called self deception. “For if a man think himself to be something, when he is nothing, he deceiveth himself” (Galatians 6:3).
Third, the great mistake made still by those insisting on this understanding of how to know that you know Him, is not understanding the significance of God’s Spirit working in us “to will and to do of His good pleasure” (Philippians 2:13). Unless properly understanding the Spirit’s role, you can easily develop a pharisaical, arminianism, i.e., my obedience makes me righteous.
A- God’s presence through His creation of the physical world (Romans 1:20) puts us on notice He is the One with whom we have to do, and He alone can save. “Look unto Me, and be ye saved, all the ends of the earth: for I am God, and there is none else” (Isaiah 45:22).
B- God’s Word enables our salvation. “The law of the LORD is perfect, converting the soul: the testimony of the LORD is sure, making wise the simple” (Psalm 19:7).
C- In this New Covenant age, God has given His Spirit to inspire us to obedience. “And I will put My Spirit within you, and cause you to walk in My statutes, and ye shall keep My judgments, and do them” (Ezekiel 36:27). This was the great achievement of the outpouring of His Spirit at Pentecost— not the miracle of tongues (Acts 2:4), but the giving of the Holy Spirit to those who gladly received God’s Word. “Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost” (Acts 2:38).
D- The Gift of the Holy Spirit is evidenced not by speaking in tongues but by obedience. “And we are His witnesses of these things; and so is also the Holy Ghost, whom God hath given to them that obey Him” (Acts 5:32). We obey Him “because He first loved us” (1John 4:19). He granted us “repentance to the acknowledging of the truth” (2Timothy 2:25). Understanding our ability and responsibility to obey, we know we never will obey without God’s help. “For it is God which worketh in you both to will and to do of His good pleasure” (Philippians 2:13).
All of this brings us back to how you know that you know you’re a Christian.
“Hereby know we that we dwell in Him, and He in us, because He hath given us of His Spirit” (1John 4:13).
If you can live without obedience, you can live without His Spirit, and you can live without the assurance of how you know that you know you’re a Christian. But, may God grant you the joy of knowing Him!