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It may be of use to premise an observation or two, the truth of which must be presupposed in all directions given to men about the exercise of their understandings in religion.

1. Religion is in itself an intelligible and rational thing, of which a clear and consistent account may be conveyed to the mind, and which may be shown to have a foundation in reason and argument, and not in the ignorance and folly of mankind.

2. Religion is a thing not only barely intelligible and rational, but apparently and obviously so, which may be easily understood and comprehended by mankind. Thus it must be, if religion be indeed the subject of the inquiry and discussion of all men; because it is certain that the faculties of the greatest part of men will never allow them to penetrate into things that are any way abstruse or difficult. Besides, we must conclude from the goodness of God that He would never make anything upon which the happiness of man depends, as it plainly does upon religion, either impossible or hard to be known or comprehended by them.

I. I shall now proceed to consider WHAT THIS EXERCISE OF THE UNDERSTANDING WHICH IS REQUIRED FROM US WITH RESPECT TO RELIGION IMPLIES.

1. It implies fairness and candour and care and diligence in our religious inquiries and disquisitions; that we keep our intellectual eye pure and unprejudiced, and withal lively and vigorous, in which state alone it is capable of discerning and tracing out the truths of religion.

2. Another thing implied in the exercise of our understandings with respect to religion is our acquiescing in the principles of it upon sufficient evidence being laid before us of their truth. As credulity, or an implicit belief, is altogether unbecoming, so likewise is a sceptical humour, which puts us upon evading evidence, which makes us doubt where there is no occasion to hesitate, where there is light enough to guide us, and to determine our judgment, according to the established rules of reasoning, and of giving our assent.

3. There is one thing more implied in the due exercise and cultivation of our understandings with respect to religion, which is our improving and increasing our knowledge of it in proportion to our abilities. If men would but faithfully endeavour to become acquainted with the entire system of religion, many of them, at least, would in a little time find that they were able to penetrate much farther into it than, before their making the experiment, they were apt to think they could do. The case of our mental and bodily powers is in general the same: both are greatly strengthened by use, whereas without it they run to rust, and contract a weakness and ineptitude for effecting things of which, through practice and custom, they would have been very capable.

II. I shall show for WHAT REASONS WE SHOULD THUS EXERCISE AND EMPLOY OUR UNDERSTANDINGS ABOUT RELIGION.

1. Both our dignity and happiness depend upon our doing so.

(1) What a shining figure does that man make who, by means of a well-tutored and refined understanding and a large stock of true knowledge, can speak pertinently upon any important subject that occurs in conversation and instruct others in the useful or entertaining sciences or arts of life!

(2) And as our dignity depends so much upon our exercising our understandings in the subjects of religion, So likewise does our happiness. For as we are formed with a love of truth and a desire of knowledge, so every discovery of truth is attended with a most sensible delight. And the more important and certain the truth which is discovered is, the greater is the pleasure which results from the knowledge of it. Now, as the great truths of religion must to every ingenious man appear to be above all others momentous, and likewise very clear and certain, the mind which inquires into them and gradually traces them out must be entertained with a most pure and continually increasing pleasure.

2. We should exercise our intelligent powers about religion, because without this there can be no merit or virtue in our religion, nor can it ever be pleasing and acceptable to God. Religion, according to the most obvious notion of it, is a reasonable, voluntary, and liberal service, flowing from principles of light and knowledge, the calm approbation of our minds, and the generous affections of our hearts.Instructions and inferences:

1. We may see the ingenuous spirit of our religion which, disdaining to take advantage of the ignorance, credulity, and inattention of mankind, lays itself open to the examination of all men, and even invites and requires them carefully to try and prove it.

2. We may see that the ignorance of the true nature and grounds of religion, or, which is very nearly related to it, the implicit belief of religion which so commonly prevails among professed Christians, even in places of the greatest liberty, is very faulty and inexcusable.

3. We may infer the iniquity of all those methods which are used to deter or discourage men in inquiring freely into religion and increasing as far as they are able their knowledge of it.

4. We may see how much it concerns every man to raise and cultivate in himself a serious, honest, and diligent, temper of searching into religion, and to propagate the same among others as far as it is in his power to do it; because in this temper the very essence of the duty of exercising our understandings about religion consists, and because it is the seedplot of truth and virtue in men, the root from whence the most generous improvements both in the knowledge and practice of our duty shoot and grow.

5. Let the knowledge which we attain to in consequence of the exercise of our understandings about religion be always substituted by us as the foundation of a good conduct and virtuous conversation in the world, Religion is, above all other sciences and institutions, practical.

(J. Orr, D. D.)

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KJV: Brethren, be not children in understanding: howbeit in malice be ye children, but in understanding be men.

WEB: Brothers, don't be children in thoughts, yet in malice be babies, but in thoughts be mature.