For this is the love of God, that we keep his commandments: and his commandments are not grievous.(heavy/burdensome) (1Jn 5:3)

 Come unto me, all ye that labour and are heavy laden, and I will give you rest. Take my yoke upon you, and learn of me; for I am meek and lowly in heart: and ye shall find rest unto your souls. For my yoke is easy, and my burden is light. (Mat 11:28-30)

For it is God which worketh in you both to will and to do of his good pleasure.
(Php 2:13)