When Peter preaches it is a partial answer to the question that can be asked about what  Jesus spent on did on earth. He was with us much more time  than recorded in the Gospels.. We know that he went back from the Temple and was "subject" to Mary and Joseph; but the following twenty years are a blank. The Gospels cover a three year period but even then much more time elapsed than reported therein. Peter was a fisherman but preaches as an authority on God's word. Jesus did teach. He was in truth "Rabbani".

Lord let me experience in full the effects of your teaching on earth. Let me strive to know you as the first disciples did and let my faith result in works outside of myself. 

Jesus resurrected is the same Jesus as known to the disciples but in a new mode of being. We cannot walk through walls; other forms and molecules get in the way. We can imagine a spiritual being being able to move about at will. Jesus calls this "a ghost"( if the translation is correct). He is flesh and bone and blood but in a mode completely beyond our experience and knowledge. The Resurrection is what gives meaning to our living; otherwise it would be hopeless. Without Christ our lives would still be God's creation but how would we be forgiven for our sins? God's creation is an act of Love and the Incarnation Crucifixion Resurrection, Jesus, is that Love in saving mercy.

Lord let the devotion I feel at this moment stay in my soul by avoiding sin and occasion of sin throughout this day. Let me truly know you.