“The Spirit himself bears witness with our spirit that we are children of God, and if children, then heirs — heirs of God and fellow heirs with Christ, provided we suffer with him in order that we may also be glorified with him.”
Simon Peter didn’t want to suffer with Jesus.
Oh, he said he did. He thought he did. When he made his promises of loyalty, he wasn’t virtue signaling to the other disciples or pretending to love his Lord more than he really did. At least, it doesn’t read that way to me in the gospels. “Lord, I am ready to go with you both to prison and to death.” “Even if I must die with you, I will not deny you!” “Even though they all fall away, I will not.” Emphatic statements made from the heart, and quite ingenuous.
Then, to his horror, Peter found he wasn’t up to the job. His aspirations exceeded his execution. Put to the test, he discovered he wasn’t really ready to suffer with the Lord Jesus after all.