Article 1, Section 9, Clause 8
Document 8
James Madison to Thomas Jefferson
9 May 1789Papers 12:143Inclosed is the Speech of the President with the Address of the House of Reps. & his reply. You will see in the caption of the address that we have pruned the ordinary stile of the degrading appendages of Excellency, Esqr. &c. and restored it to its naked dignity. Titles to both the President & vice President were formally & unanimously condemned by a vote of the H. of Reps. This I hope will shew to the friends of Republicanism that our new Government was not meant to substitute either Monarchy or Aristocracy, and that the genius of the people is as yet adverse to both.
The Founders' Constitution
Volume 3, Article 1, Section 9, Clause 8, Document 8
http://press-pubs.uchicago.edu/founders/documents/a1_9_8s8.html
The University of Chicago Press
The Papers of James Madison. Edited by William T. Hutchinson et al. Chicago and London: University of Chicago Press, 1962--77 (vols. 1--10); Charlottesville: University Press of Virginia, 1977--(vols. 11--).