Theodore Roosevelt Quote

In private life there are few beings more obnoxious than the man who is always loudly boasting; and if the boaster is not prepared to back up his words his position becomes absolutely contemptible. So it is with the nation. It is both foolish and undignified to indulge in undue self-glorification, and, above all, in loose-tongued denunciation of other peoples. Whenever on any point we come in contact with a foreign power, I hope that we shall always strive to speak courteously and respectfully of that foreign power.

The Strenuous Life: Essays and Addresses (1900) - National Duties