SIR,--Your favor of March 30th never reached my hands till May 16th. The friendly views it expresses of my conduct in general give me great satisfaction. For these testimonies of the approbation of my fellow citizens, I know that I am indebted more to their indulgent dispositions than to any peculiar claims of my own. For it can give no great claims to any one to manage honestly and disinterestedly the concerns of others trusted to him. Abundant examples of this are always under our eye. That I should lay down my charge at a proper season, is as much a duty as to have borne it faithfully. Being very sensible of bodily decays from advancing years, I ought not to doubt their effect on the mental faculties. To do so would evince either great self-love or little observation of what passes under our eyes; and I shall be fortunate if I am the first to perceive and to obey this admonition of nature. That there are in our country a great number of characters entirely equal to the management of its affairs, cannot be doubted. Many of them, indeed, have not had opportunities of making themselves known to their fellow citizens; but many have had, and the only difficulty will be to choose among them. These changes are necessary, too, for the security of republican government. If some period be not fixed, either by the Constitution or by practice, to the services of the First Magistrate, his office, though nominally elective, will, in fact, be for life; and that will soon degenerate into an inheritance. Among the felicities which have attended my administration, I am most thankful for having been able to procure coadjutors so able, so disinterested, and so harmonious. Scarcely ever has a difference of opinion appeared among us which has not, by candid consultation, been amalgamated into something which all approved; and never one which in the slightest degree affected our personal attachments. The proof we have lately seen of the innate strength of our government, is one of the most remarkable which history has recorded, and shows that we are a people capable of self-government, and worthy of it. The moment that a proclamation apprised our citizens that there were traitors among them, and what was their object, they rose upon them wherever they lurked, and crushed by their own strength what would have produced the march of armies and civil war in any other country. The government which can wield the arm of the people must be the strongest possible. I thank you for the interest you are so kind as to express in my health and welfare, and return you the same good wishes with my salutations, and assurance of respect. TO DOCTOR HORATIO TURPIN. WASHINGTON, June 10, 1807.