Understand what Jesus is warning against
The Catechism explains that deliberately rejecting God's mercy through refusal to repent can harden into final impenitence. The warning calls us to conversion. It does not set a limit on God's ability to forgive someone who turns back to Him.
A frightening thought is not a chosen refusal
A thought that intrudes without your consent is different from deliberately rejecting God. If something you actually chose troubles your conscience, bring that concrete concern to a priest. You can describe it plainly and ask for guidance without reconstructing every passing thought.
Answer the invitation in front of you
You can begin with a simple prayer for mercy, followed by an honest conversation and confession where needed. There is no need to solve the story of your whole life before making an appointment. Let the next faithful action be small enough to take today.
When the same fear keeps returning
If this question sends you into repeated searches, confession, or requests for certainty, tell a regular confessor about that pattern. Religious anxiety can become part of scrupulosity. A clinician experienced in obsessive-compulsive disorder (OCD) can help assess persistent distress and work respectfully with your faith.
A prayer for this moment
Holy Spirit, soften my heart and lead me toward truth. Help me receive mercy, turn from what is wrong, and take the next faithful step. Amen.
An original Find God’s Mercy prayer.