WORSHIP is the act of ascribing praise, glory, and thanksgiving to God: the Father, the Son, and the Holy Spirit. All humanity is called to worship God. Worship is more than being in the "great out-of-doors" or listening to a sermon or singing a hymn. God can be known in His creation, but that doesn't constitute worship. And as helpful as sermons may be, they can never offer a proper substitute for worship. Most prominent in Orthodox worship is the corporate praise, thanksgiving, and glory given to God by the Church. This worship consummates in intimate communion with God at His Holy Table.
As is said in the Liturgy, "To You is due all glory, honor, and worship, to the Father, and to the Son, and to the Holy Spirit, now and ever and unto ages of ages. Amen." In that worship we touch and experience His eternal Kingdom, the age to come, and join in adoration with the heavenly hosts. We experience the glory of the fulfillment of all things in Christ as truly all in all.