It depends. Sometimes I think of the Father, sometimes I think of the Son, sometimes I think of the Spirit. If I had to put percentages on it, I'd say 50% the Father, 30% the Son, 20% the Spirit. It does depend on which context; for example, when it comes to God dwelling within us, I automatically think of the Spirit. When I think about God walking with us and teaching us, guiding us, revealing our sins, forgiving us, healing us, and being Lord and Master, I think of Christ. When I think of God loving us, I think of the Son. When I think of God guiding us, I think of Christ leading way and the hand of the Father on our backs. When I think of lifting my prayer to Heaven, or anything related to God in Heaven, it is the Father that comes to mind. When it comes to God's blessings, rewards or punishments, I think of the Father.