Mark 14

"Then he began to curse and swear, “I do not know this Man of whom you speak!”  A second time the rooster crowed. Then Peter called to mind the word that Jesus had said to him, “Before the rooster crows twice, you will deny Me three times.” And when he thought about it, he wept." vv.71-72

Read chapter 14.

Here we see what happened to Peter when under pressure and stressed and then when realized the test he failed at.  The Greek word for curse here is a form of anathema, which is used also in scripture to talk about those cut off from eternity with God.  It says that Peter cursed and swore against knowing Jesus.  This doesn't mean that he said vulgar words, but rather mentioned that he'd rather be caught off from God or from Israel if he didn't speak the truth, which he clearly lied but we also know that the Lord forgave him.  Once Peter hears the rooster crow the second time he's reminded of the conversation with the Lord in verses 27-31.  Then something he never thought he'd do, this truth calls him out in his lack of faith and failure that then causes him to cry.  Let's not think our own ability will help us stand in hard times, but the Lord.  How do you respond when fear or are under stress or pressure of who the Lord is to you and in your life?  When have you realized, or what truth spoke to you, in your lack of faith or denial of Him causing you to feel remorse?