Good topic Pilgim. I believe the motivation for growing in Holiness is Love. We love because He first Loved us.
The mission of the church we attend here in Chattanooga is to learn to enjoy Jesus. Simple. As I learn more about Him and I see the beauty and excellency of His character, I want more and more to be like Him and to be with Him forever. Scripture says "Without holiness, no one will see the Lord" Heb.12;14
I could go on and on but I won't. As St. Augustine said,"Thou hast made us for thyself O Lord, and our hearts will never rest until they rest in thee."
My humble thoughts.

Be killing sin or it will be killing you. John Owen