John Newton wrote a beautiful hymn

In Evil Long I Took Delight

In evil long I took delight,
Unawed by shame or fear,
Till a new object struck my sight,
And stopped my wild career.

I saw One hanging on a tree,
In agony and blood,
Who fixed His languid eyes on me,
As near His cross I stood.

Sure, never to my latest breath,
Can I forget that look;
It seemed to charge me with His death,
Though not a word He spoke.

My conscience felt and owned the guilt,
And plunged me in despair,
I saw my sins His blood had spilt,
And helped to nail Him there.

A second look He gave, which said,
"I freely all forgive;
This blood is for thy ransom paid;
I die that thou mayst live."

Thus, while His death my sin displays
In all its blackest hue,
Such is the mystery of grace,
It seals my pardon too.

With pleasing grief and mournful joy,
My spirit now is fill'd,
That I should such a life destroy,
Yet live by Him I kill'd.

Of this gospel I was made a minister according to the gift of God's grace, which was given me by the working of his power. To me, though I am the very least of all the saints, this grace was given, to preach to the Gentiles the unsearchable riches of Christ, and to bring to light for everyone what is the plan of the mystery hidden for ages in God, who created all things, so that through the church the manifold wisdom of God might now be made known to the rulers and authorities in the heavenly places. This was according to the eternal purpose that he has realized in Christ Jesus our Lord, in whom we have boldness and access Ephesians 3:7-12.

1Corinthians 2:1-3. And I, when I came to you, brothers, did not come proclaiming to you the testimony of God with lofty speech or wisdom. For I decided to know nothing among you except Jesus Christ and him crucified.

Hebrews 4:12,13.  For the word of God is living and active, sharper than any two-edged sword, piercing to the division of soul and of spirit, of joints and of marrow, and discerning the thoughts and intentions of the heart. And no creature is hidden from his sight, but all are naked and exposed to the eyes of him to whom we must give account.

Has your heart been illuminated to understand that the atoning death of the Lord Jesus for your sins is the most important truth in the universe and in all time and in eternity?  It is most important ever. It is most important for you.  If you have not experienced this as true for you, you are already eternally lost and you need to be saved. If you reject this truth you may have already crossed your own "deadline". Your heart may already be too hard to ever be saved. If you are anxious that this may be you, you must humble yourself before God and seek to know this truth personally for yourself. 

1Corinthians 15: 1-8 Now I would remind you, brothers, of the gospel I preached to you, which you received, in which you stand, and by which you are being saved, if you hold fast to the word I preached to you—unless you believed in vain.

For I delivered to you as of first importance what I also received: that Christ died for our sins in accordance with the Scriptures, that he was buried, that he was raised on the third day in accordance with the Scriptures, and that he appeared to Cephas, then to the twelve. Then he appeared to more than five hundred brothers at one time, most of whom are still alive, though some have fallen asleep. Then he appeared to James, then to all the apostles. Last of all, as to one untimely born, he appeared also to me