My courage and my resolution is firm; but my hopes fluctuate, and my spirits are often depressed. - Mary Shelley
The eternal difference between right and wrong does not fluctuate, it is immutable. - Patrick Henry
Your emotions are meant to fluctuate, just like your blood pressure is meant to fluctuate. It’s a system that’s supposed to move back and forth, between happy and unhappy. That’s how the system guides you through the world. - Daniel Todd Gilbert