Do you remember hearing or reading when Peter denied Jesus three times! Somthing that he though would never do! Who was the last person to do that! But well, in the heat of the situation, he did! Biggest mistake ever!
But Hold up! --> when Jesus visited him when he was risen, he asked him the same question again to which Peter replied YES I LOVE YOU! He Got a second chance and with that he got the gift of devine intructions!