"You shall love the Lord your God with all your heart, with all your soul, with your mind, and with all your strength. This is the first commandment" (Mark 12:30)

From the Lord's Word:

 Worship of the Heart (PDF version for printing)
Worship of the Heart
(HTML version)

Reading:

Read about the concept in "The Activity of Love" by the Rt. Rev. Brian W. Keith
"No Other Gods" by the Rev. Kurt Horigan Asplundh
"Worshiping in Spirit and in Truth" by the Rev. Frederick Chapin
"Worshiping the One True God" a sermon by the Rt. Rev. Brian W. Keith
"Living, Joyous Worship" a sermon by the Rev. Morley Rich

Activities:

Prayer:  Prayers on Worship with the Heart (PDF)
 Spiritual Task: The First Commandment by Rev. David Roth (PDF)
 Spiritual Task: Identify and Name False Gods by Rev. Ray and Star Silverman (PDF)
For more on applying the Ten Commandments to your life, you can order Rise Above It - a book developed by Rev. Ray and Star Silverman from a series of seminars.
 False Gods (PDF)
 "This is our God" (a border for a picture of the Lord) (PDF)
 "Dove or Owl?" (PDF)

Songs:

 Worship the Lord in the Beauty of Holiness (PDF)
I Come into Thy House (PDF)
 Joyful, Joyful, We Adore Thee (PDF)
Praise the Lord! by Terry Schnarr (PDF)