Certainty
"That you may know...." Matthew 9:4
See also God's Word and What it means to be a Christian
"I know that this will turn out for my deliverance through your prayer and the supply of the Spirit of Jesus Christ, according to my earnest expectation and hope that in nothing I shall be ashamed, but with all boldness, as always, so now also Christ will be magnified in my body, whether by life or by death. For to me, to live is Christ, and to die is gain. But if I live on in the flesh, this will mean fruit from my labor; yet what I shall choose I cannot tell. For I am hard-pressed between the two, having a desire to depart and be with Christ, which is far better. Nevertheless to remain in the flesh is more needful for you. And being confident of this, I know that I shall remain and continue with you all for your progress and joy of faith." Philippians 1:19-25
"...for I know whom I have believed and am persuaded that He is able to keep what I have committed to Him until that Day." 2 Timothy 1:12
"These things I have written to you who believe in the name of the Son of God, that you may know that you have eternal life, and that you may continue to believe in the name of the Son of God." 1 John 5:13
"....this is eternal life, that they may know You, the only true God, and Jesus Christ whom You have sent." John 17:3"...you He made alive, who were dead in trespasses and sins, in which you once walked according to the course of this world, according to the prince of the power of the air, the spirit who now works in the sons of disobedience, among whom also we all once conducted ourselves in the lusts of our flesh, fulfilling the desires of the flesh and of the mind, and were by nature children of wrath, just as the others.
"But God, who is rich in mercy, because of His great love with which He loved us, even when we were dead in trespasses, made us alive together with Christ (by grace you have been saved), and raised us up together, and made us sit together in the heavenly places in Christ Jesus, that in the ages to come He might show the exceeding riches of His grace in His kindness toward us in Christ Jesus. 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. For we are His workmanship, created in Christ Jesus for good works, which God prepared beforehand that we should walk in them." Ephesians 2:1-10"'...that you may know that the Son of Man has power on earth to forgive sins'—then He said to the paralytic, 'Arise, take up your bed, and go to your house.' And he arose and departed to his house. Now when the multitudes saw it, they marveled and glorified God, who had given such power to men." Matthew 9:4-8
"Therefore I also, after I heard of your faith in the Lord Jesus and your love for all the saints, do not cease to give thanks for you, making mention of you in my prayers: that the God of our Lord Jesus Christ, the Father of glory, may give to you the spirit of wisdom and revelation in the knowledge of Him, the eyes of your understanding being enlightened; that you may know what is the hope of His calling, what are the riches of the glory of His inheritance in the saints, and what is the exceeding greatness of His power toward us who believe...." Ephesians 1:15-19
Jesus said, “If I do not do the works of My Father, do not believe Me; but if I do, though you do not believe Me, believe the works, that you may know and believe that the Father is in Me, and I in Him.” John 10:37-38
"...one of the soldiers pierced His side with a spear, and immediately blood and water came out. And he who has seen has testified, and his testimony is true; and he knows that he is telling the truth, so that you may believe. For these things were done that the Scripture should be fulfilled, 'Not one of His bones shall be broken.' And again another Scripture says, 'They shall look on Him whom they pierced.'” John 19:34-36"If you confess with your mouth, 'Jesus is Lord,' and believe in your heart that God raised Him from the dead, you will be saved.” Romans 10:9 [Remember, this was spoken in a world that hated those who followed Jesus. To better understand this verse, listen to this short message: Commonly Misused Passages]
"I also count all things loss for the excellence of the knowledge of Christ Jesus my Lord, for whom I have suffered the loss of all things, and count them as rubbish, that I may gain Christ and be found in Him, not having my own righteousness, which is from the law, but that which is through faith in Christ, the righteousness which is from God by faith; that I may know Him and the power of His resurrection, and the fellowship of His sufferings, being conformed to His death, if, by any means, I may attain to the resurrection from the dead." Philippians 3:8-11
"This hope we have as an anchor of the soul, both sure and steadfast..." Hebrews 6:19
"Inasmuch as many have taken in hand to set in order a narrative of those things which have been fulfilled among us, just as those who from the beginning were eyewitnesses and ministers of the word delivered them to us, it seemed good to me also, having had perfect understanding of all things from the very first, to write to you an orderly account, most excellent Theophilus, that you may know the certainty of those things in which you were instructed." Luke 1:1-4
"...these [Scriptures] are written that you may believe that Jesus is the Christ, the Son of God, and that believing you may have life in His name." John 20:30-31