Simon had all the fervour and emotional enthusiasm in the world. But he was controlled by his emotions -- and that left him vulnerable.
When tested he was Simon -- a reed, not Peter -- a Rock.
But Christ has prayed for his preservation. When we find our inner Simon making us vulnerable, remember that Christ is our assurance.
It is not us. For we all wobble.
31 “Simon, Simon, behold, Satan demanded to have you, that he might sift you like wheat, 32 but I have prayed for you that your faith may not fail. And when you have turned again, strengthen your brothers.” 33 Peter said to him, “Lord, I am ready to go with you both to prison and to death.”
54 Then they seized him and led him away, bringing him into the high priest's house, and Peter was following at a distance. 55 And when they had kindled a fire in the middle of the courtyard and sat down together, Peter sat down among them. 56 Then a servant girl, seeing him as he sat in the light and looking closely at him, said, “This man also was with him.” 57 But he denied it, saying, “Woman, I do not know him.” 58 And a little later someone else saw him and said, “You also are one of them.” But Peter said, “Man, I am not.” 59 And after an interval of about an hour still another insisted, saying, “Certainly this man also was with him, for he too is a Galilean.” 60 But Peter said, “Man, I do not know what you are talking about.” And immediately, while he was still speaking, the cock crowed. 61 And the Lord turned and looked at Peter. And Peter remembered the saying of the Lord, how he had said to him, “Before the cock crows today, you will deny me three times.” 62 And he went out and wept bitterly.