St. John Marie Vianney (The Cure of Ars) is the Patron of Priests. His feast is celebrated on August 4th. Here is a prayer by St. John Vianney expressing true love for God.
I love You, O my God, and my only desire is to love you until the last breath of my life.
I love You, O my infinitely lovable God, and I would rather die loving You, than live without loving You.
I love You, Lord and the only grace I ask is to love You eternally.
My God, if my tongue cannot say in every moment that I love You, I want my heart to repeat it to You as often as I draw breath. Amen.