If the Holy Spirit makes us fossils, what does the Trinity do?

     We heard last Sunday, Pentecost Sunday, how the Holy Spirit works in and through God's people on earth to help us leave our mark on the world, much like fossils leave their mark.  We know from studying fossils how those organisms lived, what they ate, what their purpose was, and what role they played in the larger ecosystem.  We, as disciples of the living Jesus, leave our marks and we pray that the Spirit would help us to leave our marks so that in generations to come, people can look back and see what God was doing in the world through us by the fossils we leave. 
     Still in the midst of trying to comprehend how the Spirit is working in us, living, moving, and breathing in the world since the day of Pentecost, we come to Holy Trinity Sunday.  These two celebrations come in rapid succession, one after another, and because of the sheer greatness of these celebrations it feels as though our heads are left spinning, held on only by the thin thread of faith that somehow manages to comprehend the incomprehensible.
     So if the Holy Spirit makes fossils out of us, what is the role of the whole Trinity?  Our gospel lesson comes from Matthew 28.16-20 and we get a front row seat to Jesus' final words to his disciples.  The text has three specific pieces: the disciples worshiped and doubted, Jesus gives two commands, and Jesus makes his final promise.  The Trinity is explicitly mentioned in Jesus' first command, to baptize disciples in the name of the Father, and of the Son, and of the Holy Spirit.  Other than that, Jesus leaves us pretty clueless.  He gives us a command but very little guidance on how to carry it out. 
     I think that it must have something to do with the nature of the Holy Trinity, and that the Triune God is the source, power, and even completion of the commands.  But the question remains, how?  How does the Holy Trinity work to help us fulfill Jesus' last command?  How does the Trinity grant the faith we need so that even when we are doubting we can worship?  What role does the Trinity play in how we remember Jesus is with us always?  Or aside from remembering, just simply trusting in the first place? 
    Yes, the Holy Trinity remains one of the greatest  mysteries of the Christian faith and we, as people of that faith, continue to worship and praise our Triune God even when we don't fully understand.  But there is that part of me that strives to understand everything there is about a faith that cannot be understood, and so I continue to ponder: if the Holy Spirit makes us fossils, what does the Trinity do?