We all make mistakes.
I have made mistakes in the Christian life, which I have later bitterly regretted. When that happens, we have a tendency to despair. We think "I've made a mess of it. What's the use of trying now?"
Consider the story beginning at Matt 26:36. They were in Gethsemane, shortly before Jesus was crucified. He asked His disciples to pray with Him. They fell asleep. Twice.
He said "The hour is at hand, and the Son of Man is being betrayed into the hands of sinners. Rise, let us be going." The damage was done, and could not be undone. But Jesus did not condemn. It was as though He was saying "Come on. Let's go on to what's next."
I remember once when I was bemoaning my failings. It was as though God spoke to me. He said *You're my son." Just three words. But those three words kept me going for days.
If we make a mistake, it isn't the end. There are still lessons to be learned; still more victories to be won. Pick yourself up and keep on going. Have we entered into a personal relationship with Christ? We are still citizens of the kingdom. Still sons of a loving Heavenly Father.