Palm and olive branches wave in St. Peter's Square , as Pope Francis leads a Palm Sunday service before more than 100,000 people.<br/> <br />The pope carries a pastoral cross carved from olive wood by the inmates of an Italian jail<br/> <br />He sets aside his prepared homily delivering an impromptu address, asking listeners to think about who they are.<br/> <br />(SOUNDBITE) (Italian) POPE FRANCIS, SAYING:<br/> <br />"Where is my heart? Who among these people am I like? This question will remain with us all week."<br/> <br />Palm Sunday marks the day that Jesus rode into Jerusalem to the cheers of the crowds the week before Christians believe he rose from the dead.