This is Thanksgiving Day (in Canada). We came upon this in our devotional for October 7:

        O LORD, forgive my sin,

           And deign to put within

A calm, obedient heart, a patient mind;

           That I may murmur not,

           Though bitter seem my lot;

For hearts unthankful can no blessing find.

Rutilius (1604)

From “Daily Strength for Daily Needs”, selected by Mary W. Tileston, 34th Edition, 1930.