What Evidence in Scripture Identifies the Holy Spirit as a Person?

Questions about evidence in Scripture that identifies the Holy Spirit as a person rather than the transforming power of God, whether Mark 13:33 means that the Holy Spirit doesn’t know the day of Christ’s return, and thoughts on contemplative prayer and other popular spiritual formation practices.  

• Aside from translators’ use of the male pronoun, what evidence in Scripture identifies the Holy Spirit as a “person” as opposed to the transforming power of God?
• Does Mark 13:33 mean that the Holy Spirit does not know the day of Christ’s return?
• Can you comment on popular spiritual formation practices such as contemplative prayer, lectio divina, and the need to explore our past in order for the Spirit to work in us to remove sin?