One I've been going over lately...
“A Christian should follow his occupation with contentment. Is your business here clogged with any difficulties and inconveniences? Contentment under those difficulties is no little part of your homage to that King who hath placed you where you are by His call.”
Cotton Mather, 1663-1728
...trying to remember that all through the day when the "difficulties and inconveniences" come along-but oh, the delight and the richness of joy He gives through it all!