Sundays, Mondays and a great unknown line

As my readers know, I tend to get the Sunday blues because of the upcoming Monday, to the point that I downright dislike Sundays and it often spoils my weekend. My wife told me something very wise about it, which I will try to follow: "Don't let the thought of Mondays spoil your Sundays." Like I said, pure wisdom, and a great unknown line I absolutely had to share.