Paul had to remind Timothy to stir up the gift of God within him (2 Timothy 1:6, 7), and so he should not be ashamed of the good that God has done for us,
“Therefore do not be ashamed of the testimony of our Lord, nor of me His prisoner, but share with me in the sufferings for the gospel according to the power of God, who has saved us and called us with a holy calling, not according to our works, but according to His own purpose and grace which was given to us in Christ Jesus before time began” (2 Timothy 1:8-9).
God saved us. That is the best news that we have ever heard or ever will hear! He saved us to be holy and that fulfills His purpose and grace that He has shown us in Christ Jesus.
This plan He has had since before time began! Therefore do not be ashamed of Him!