In the third place, that the whole duty of man is comprised in this one great republican principle, "Do as you would be done unto," has appeared so notorious to the world in all ages, that it has been universally agreed upon, as the unerring rule of action, and the basis of happiness: by the observing of which there can be neither oppression, deceit, or injustice of any kind. The duty of man is his interest; his interest is to make himself happy; and the surest and best way of doing this is to promote the prosperity of the whole.
Finally, that system of religion which contradicts itself, cannot be wholly true.--That which is not consistent with reason, or agreeable to the order of nature, must be false, as different from the will of the Deity, displayed in all his works:--And, that which tends to promote discord, pride, and deceit, is prejudicial to society, and ought to be discountenanced and opposed by every good man.
It appears to be the general opinion among the learned, that all matter is, more or less, in a continual state of transmutation; that there is a perpetual repulsion and attraction in nature. It is also the opinion of many philosophers, that the human mind is never quite stationary.
That locality, early habits, examples, affections, and associations have the greatest effect in forming the characters and opinions of men, is evident to our senses; and that after the character may be considered to be formed, a contrary course of habits, &c. of equally long or longer continuance will generally produce a contrary character.
Every attentive observer must perceive, that we sometimes dislike and entertain an unfavourable opinion of what we at another time approve and cordially agree to. To a cursory examiner these alterations may appear to take place arbitrarily: but to one acquainted with the philosophy of the human mind, accustomed minutely to trace the different links and associations which bias our ideas, they will appear, so far from being arbitrary or supernatural, to be perfectly natural and agreeable to the wise order of things. It would seem that most parties agree to the reasons given by the learned for such alterations, &c., except they be in matters of religion; here each party abandons the usual methods of philosophising, and has recourse to the supernatural interference of divine agency.