1 John's Ten Signs of a True Convert

1.  A true convert admits he or she is a sinner. He does not believe he can go to heaven by being a "good" person. She understands her own totally depravity. (1 John 1:8)

• "If we say that we have no sin, we deceive ourselves, and the truth is not in us."

2.  A true convert lives a life of obedience by keeping God's commandments more often than breaking them. A true convert is not a habitual sinner. There's a difference between stumbling into sin and jumping in with both feet. While true converts may continue to sin as part of the struggle with our sin nature, the life of a true convert is marked by a desire to pursue holiness and walk in obedience to God's Word. (1 John 2:3-6, 3:6, 5:2) 

• "And hereby we do know that we know him, if we keep his commandments. He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him. But whoso keepeth his word, in him verily is the love of God perfected: hereby know we that we are in him. He that saith he abideth in him ought himself also so to walk, even as he walked." 1 John 2:3-6
• "Whosoever abideth in him sinneth not: whosoever sinneth hath not seen him, neither known him." 1 John 3:6
• "By this we know that we love the children of God, when we love God, and keep his commandments." 1 John 5:2 

3.  A true convert does not harbor hate for his brother but displays forgiveness, love, and compassion. (1 John 2:9, 2:11, 3:15, 4:16, 4:20)

• "He that saith he is in the light, and hateth his brother, is in darkness even until now."1 John 2:9 
• "But he that hateth his brother is in darkness, and walketh in darkness, and knoweth not whither he goeth, because that darkness hath blinded his eyes."  1 John 2:11
• "And we have known and believed the love that God hath to us. God is love; and he that dwelleth in love dwelleth in God, and God in him." 1 John 4:16
• "If a man say, I love God, and hateth his brother, he is a liar: for he that loveth not his brother whom he hath seen, how can he love God whom he hath not seen?" 1 John 4:20

4.  A true convert does not love the world or the things of the world, nor the world's system of evil, ruled by Satan. (1 John 2:15)

• "Love not the world, neither the things that are in the world. If any man love the world, the love of the Father is not in him." 1 John 2:15

5.  A true convert proclaims Jesus Christ as the Son of God and defends the exclusivity of Christ in a world of multiple religious systems. (1 John 4:15)

• "Whosoever shall confess that Jesus is the Son of God, God dwelleth in him, and he in God." 1 John 4:15

6.  A true convert hopes and longs for the return of the Lord. (1 John 3:2-3)

• "Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is. And every man that hath this hope in him purifieth himself, even as he is pure." 1 John 3:2-3

7.  A true convert desires to serve and help other Christians. (1 John 3:17, 3:14)

• "But whoso hath this world's good, and seeth his brother have need, and shutteth up his bowels of compassion from him, how dwelleth the love of God in him?" 1 John 3:17
• "We know that we have passed from death unto life, because we love the brethren. He that loveth not his brother abideth in death." 1 John 3:14

8.  A true convert loves being with other believers and hearing the Word taught. (1 John 5:1)

• "Whosoever believeth that Jesus is the Christ is born of God: and every one that loveth him that begat loveth him also that is begotten of him." 1 John 5:1

9.  A true convert rejects false teaching. (1 John 2:22-23) 

• "Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son. Whosoever denieth the Son, the same hath not the Father: (but) he that acknowledgeth the Son hath the Father also." 1 John 2:22-23

10. A true convert remains in the truth and perseveres in the faith. (1 John 2:24)

• "Let that therefore abide in you, which ye have heard from the beginning. If that which ye have heard from the beginning shall remain in you, ye also shall continue in the Son, and in the Father." 1 John 2:24 

Reference 
True and False Conversion - Ray Comfort