Pentecost Sunday and its meaning.  Is in knowing and in accepting that the Holy Spirit is living within you.  Once we allow that truth to sink in, we can then move forward living in/out  this great truth.  If we have not yet  discovered this awesome and wonderful reality, it is something worth praying about, first with God.  That's a good start, and from there, you have a rock solid foundation to begin building  a worthy life with God.