"And He (Jesus) said to them, 'Go into all the world and preach the gospel to every creature.'" Mark 16:15

Matthew 28:19-20 says it this way,
"Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all things that I have commanded you; and lo, I am with you always, even to the end of the age."

Luke, in Acts 1:8, says,
"But you shall receive power when the Holy Spirit has come upon you; and you shall be witnesses to Me in Jerusalem, and in all Judea and Samaria, and to the end of he earth."

This is the great commission given to the apostles of the first century and as Believers we too are to share the Gospel -- the Good News with others.
We all have people in are lives who do not know our Savior Jesus Christ, those who are always in our prayers. Our lives should be a testimony that we are different. Hopefully, that difference will prompt them to ask Why!
Scripture tells us in 1 Peter 3:15,
"But sanctify Christ as Lord in your hearts, always being ready to make a defense to everyone who asks you to give an account for the hope that is in you..."

Are you prepared to do that? Can you share with them the gospel from conviction of sin to glorification? Even non believers have seen and/or read John 3:16, but we need to be able to add Scripture to help in their understanding. Remember it is the Godhead who brings about the conversion, we are merely the spokespersons God uses to give the message to those whose heart has been prepared to receive it.

I will give some Scripture verses, but we each need to fill them out by reading them in context in our own study.
Sin and the conviction of sin:
"For all have sinned and fall short of the glory of God." Romans 3:23 "For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord." Romans 6:23 "And He (the Holy Spirit), when He comes, will convict the world concerning sin, and righteousness, and judgment." John 16:8

Salvation: a gift of God, by the grace of God, because of the love and mercy of God:
"But God, who is rich in mercy, because of His great love with which He loved us, even when we were dead in trespasses, and made us alive together with Christ (by grace you have been saved)." Ephesians 2:4-5 "For by grace you have been saved through faith, and that not of yourselves; it is the gift of God, not of works lest anyone should boast."
Vs. 8-9

New birth in Christ:
"He died for all that they who live should no longer live for themselves, but for Him who died and rose again on their behalf." 2 Corinthians 5:15 "Therefore, if any man is in Christ, he is a new creation; old things have passed away; behold, all things have become new." Vs. 17 "Now all these things are from God, who reconciled us to Himself through Christ..." Vs. 18 "He (God) made Him (Jesus) who knew no sin to be sin on our behalf, that we might become the righteousness of God in Him." Vs. 21

Justification:
"Therefore, having been justified by faith, we have peace with God through our Lord Jesus Christ, through whom also we have access by faith into this grace in which we stand, and rejoice in hope of the glory of God." 
Romans 5:1-2

Concerning judgment:
"Most assuredly, I say to you, he who hears My word and believes in Him who sent Me has everlasting life, and shall not come into judgment, but has passed from death into life." John 5:24

It is God's doing from beginning to end!
"But by His doing you are in Christ Jesus, who became to us wisdom from God, and righteousness and sanctification, and redemption."
1 Corinthians 1:30

Scripture gives us this wonderful assurance, "For whom He foreknew, He also predestined to become conformed to the image of His Son, that He might be the firstborn among many brethren; and whom He predestined, these He also called; and whom He called, these He also justified; and whom He justified; these He also glorified."
Romans 8:29-30

As 1 Peter 3:15 tells us, let us 'always be prepare to give a defense for the hope that is in us'!

Lord, we desire to be those obedient earthen vessels that share Your Word whenever, wherever and with whomever You please. We love, adore and worship You! And we give You thanks for this glorious life in You. 
Amen