It applies, too, on a larger scale, to the ministerial life as a whole. Valuable as an initial call may be, it will not do to trade too long on such a memory. A ministry of growing power must be one of growing experience. The soul must be in touch with God and enjoy golden hours of fresh revelation. The truth must come to the minister as the satisfaction of his own needs and the answer to his perplexities; and he must be able to use the language of religion, not as the nearest equivalent he can find for that which he believes others to be passing through, but as the exact equivalent of that which he has passed through himself. There are many rules for praying in public, and a competent minister will not neglect them; but there is one rule worth all the rest put together, and it is this: Be a man of prayer yourself; and then the congregation will feel, as you open your lips to lead their devotions, that you are entering an accustomed presence and speaking to a well-known Friend. There are arts of study by which the contents of the Bible can be made available for the edification of others; but this is the best rule: Study God's Word diligently for your own edification; and then, when it has become more to you than your necessary food and sweeter than honey or the honey-comb, it will be impossible for you to speak of it to others without a glow passing into your words which will betray the delight with which it has inspired yourself.[13] Perhaps of all causes of ministerial failure the commonest lies here; and of all ministerial qualifications, this, although the simplest, is the most trying. Either we have never had a spiritual experience deep and thorough enough to lay bare to us the mysteries of the soul; or our experience is too old, and we have repeated it so often that it has become stale to ourselves; or we have made reading a substitute for thinking; or we have allowed the number and the pressure of the duties of our office to curtail our prayers and shut us out of our studies; or we have learned the professional tone in which things ought to be said, and we can fall into it without present feeling. Power for work like ours is only to be acquired in secret; it is only the man who has a large, varied and original life with God who can go on speaking about the things of God with fresh interest; but a thousand things happen to interfere with such a prayerful and meditative life. It is not because our arguments for religion are not strong enough that we fail to convince, but because the argument is wanting which never fails to tell; and this is religion itself. People everywhere can appreciate this, and nothing can supply the lack of it. The hearers may not know why their minister, with all his gifts, does not make a religious impression on them; but it is because he is not himself a spiritual power.[14]