William Cunningham's advice to theology students on their use of the Sabbath

Iain D Campbell
"Your professional studies may rightly occupy the principal share of your time and attention for six days in the week, just like the ordinary lawful secular business of other men; but on the Lord's Day you ought to be chiefly influenced by the consideration, not so much that you are students of theology preparing for the work of the ministry, that you may be made instrumental in promoting the salvation of others, but rather that you are, in common with many of the poorest, humblest and most illiterate of the human race, believers in the Lord Jesus Christ, who are bound to work out your own salvation with fear and trembling, and to become progressively more meet for the inheritance of the saints in light" 
(Theological Lectures, (1878, reprinted 1990), p95.