As to these three modes of life, the contemplative, the active, and the contemplative-active, a man can live the life of faith in any of these three and get to heaven. What is not indifferent is that he love truth and do what charity demands. No man must be so committed to contemplation as, in his contemplation, to give no thought to his neighbor’s needs, nor so absorbed in action as to dispense with the contemplation of God.
The attraction of leisure ought not to be empty-headed inactivity, but in the quest or discovery of truth, both for his own progress and for the purpose of sharing ungrudgingly with others. …
No man is forbidden to pursue knowledge of the truth, for that is the purpose of legitimate leisure…Thus, it is the love of study that seeks a holy leisure; and only the compulsion of charity that shoulders necessary activity. If no such burden is placed on one’s shoulders, time should be passed in study and contemplation. But, once the burden is on the back, it should be carried, since charity so demands. Even so, however, no one should give up entirely his delight in learning, for the sweetness he once knew may be lost and the burden he bears overwhelm him.
~St. Augustine, The City of God, Book XIX, Ch. 19.