Be not thou therefore ashamed of the testimony of our Lord, nor of me his prisoner: but be thou partaker of the afflictions of the gospel according to the power of God; who hath saved us, and called us with an holy calling, not according to our works, but according to His own purpose and grace, which was given us in Christ Jesus before the world began, but is now made manifest by the appearing of our Saviour Jesus Christ, who hath abolished death, and hath brought life and immortality to light through the gospel: whereunto I am appointed a preacher, and an apostle, and a teacher of the Gentiles.  For the which cause I also suffer these things: nevertheless I am not ashamed: for I know whom I have believed, and am persuaded that He is able to keep that which I have committed unto Him against that day.
2 Timothy 1:8-12

These verses, at least a couple of them are familiar to many Christians; the last one especially.

Being ashamed of the gospel of Jesus Christ should cause us to be on guard of our slips and falls in faith. It happens to the strongest, and to those who are weak.

This is not the first time Paul says, “I am not ashamed..” He says it very clearly in Romans 1:16. Let us not be ashamed of the gospel of Jesus Christ. Let us be fully persuaded, and committed to faithfully serving Him and others in His name.

For the which cause I also suffer these things: nevertheless I am not ashamed: for I know whom I have believed, and am persuaded that He is able to keep that which I have committed unto Him against that day.
2 Timothy 1:8-12

Is Jesus able to keep us? He most certainly is.  Who else has that ability to keep us?  If you are persuaded and committed to Him.  He will keep you in His gracious hands.