In his blessing to Yissachar, Jacob says: He saw that tranquility was good, and that his land was pleasant, so he bent his shoulder to bear. (Genesis 49:15)
Rav Yitzchak of Vorka explained this verse in the following way:
“He saw that tranquility was good” – When does a person achieve true tranquility?
When he “bends his shoulder to bear” – When he decides to be a patient person, ready to bear everything that comes his way.