1: We are all sinners
For all have sinned, and come short of the glory of God; Romans 3:23 (AV)

2: We cannot do any good thing to pay for our sins
As it is written, There is none righteous, no, not one: Romans 3:10 (AV)
They are all gone out of the way, they are together become unprofitable; there is none that doeth good, no, not one. Romans 3:12 (AV)
Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law [is] the knowledge of sin. Romans 3:20 (AV)

3: Death and eternal hell are the only way to pay for our sins
For the wages of sin [is] death; but the gift of God [is] eternal life through Jesus Christ our Lord. Romans 6:23 (AV)
And death and hell were cast into the lake of fire. This is the second death. Revelation 20:14 (AV)

4: Jesus paid the price to save us
For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures; And that he was buried, and that he rose again the third day according to the scriptures: 1 Corinthians 15:3-4 (AV)

5: You must believe that Jesus Christ is your only hope for eternal salvation
Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me. John 14:6 (AV)
And they said, Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house. Acts 16:31 (AV)