The tone is extremely thoughtful or reflective. Elinor looked at the whole relationship scenario and the possible consequences of living under Mrs. Ferrar's characteristics. She knew within herself that she was spared of a difficult future and yet she kept it all to herself.
The inference that can be drawn from these lines of Feste's song in Shakespeare's Twelfth Night is that they are making reference to life's unpredictability and; therefore, they urge people to enjoy their youth.
