A crisis like his wife's critical illness created a demand for much extra expense, for which no provision had been made, not through carelessness and improvidence, but upon principle. Mr. Muller held that to lay by in store is inconsistent with full trust in God, who in such case would send us to our hoardings before answering prayer for more supplies. Experience in this emergency justified his faith; for not only were all unforeseen wants supplied, but even the delicacies and refreshments needful for the sick and weak; and the two medical attendants graciously declined all remuneration for services which extended through six weeks. Thus was there given of the Lord more than could have been laid up against this season of trial, even had the attempt been made. The principle of committing future wants to the Lord's care, thus acted upon at this time, he and his wife consistently followed so long as they lived and worked together. Experience confirmed them in the conviction that a life of trust forbids laying up treasures against unforeseen foreseen needs, since with God _no emergency is unforeseen and no want unprovided for;_ and He may be as implicitly trusted for extraordinary needs as for our common daily bread. Yet another law, kindred to this and thoroughly inwrought into Mr. Muller's habit of life, was _never to contract debt,_ whether for personal purposes or the Lord's work. This matter was settled on scriptural grounds once for all (Romans xiii. 8), and he and his wife determined if need be to suffer starvation rather than to buy anything without paying for it when bought. Thus they always knew how much they had to buy with, and what they had left to give to others or use for others' wants.