On this Baptism of the Lord Sunday, we are reminded that the voice of the Lord is powerful. But the same powerful voice that makes the earth shake is the same powerful voice that comforts the people of God. As Psalm 95:7-8 implores us, “Today, if you hear his voice, do not harden your hearts.”
On Trinity Sunday, we celebrate the mystery of God's Being as three Persons - Father, Son, and Holy Spirit. In Psalm 8, David is encouraging us to praise the Lord for His majesty displayed in the heavens and the earth. Whether we look at the heavens or the earth, we see the glory of the Lord.
On Pentecost Sunday, we celebrate the outpouring of the Holy Spirit. God's Spirit is not only involved in creating us and sustaining us and re-creating us as children of God and citizens of God's eternal kingdom, but God's Spirit is also involved in the restoration of all things that is to come. Therefore, "bless the Lord, O my soul!"