It is wisdom to take occasional furlough. In the long run, we shall do more by sometimes doing less. On, on, on for ever, without recreation may suit spirits emancipated from this 'heavy clay', but while we are in this tabernacle, we must every now and then cry halt, and serve the Lord by holy inaction and consecrated leisure. Let no tender conscience doubt the lawfulness of going out of harness for a while
Lectures to My Students (ed. 1883)