John MacArthur, in a sermon on 1 Thessalonians 5:17 "pray without ceasing" identified 10 motives for prayer which will help us obey this command:
#1 A desire for the Lord's glory.
#2 A desire for fellowship with God.
#3 A desire for needs to be met.
#4 A desire for wisdom.
#5 A desire for deliverance from trouble.
#6 A desire for relief from fear and worry.
#7 A desire to offer thanks for God's past blessings.
#8 A desire to be freed from the guilt of sin.
#9 A desire for the salvation of the lost.
#10 A desire for the spiritual growth of believers.
There's enough there to keep us praying every moment of our lives, in a spirit of fellowship with God, thankful for all that He has done and is doing, and eager to see Him continue to work in our lives and the lives of those around us.
Do you not have these desires? Cultivate them through time spent in God's Word!