You can't reason yourself back into cheerfulness any more than you can reason yourself into an extra six inches in height.
Interpretation
Cheerfulness cannot be achieved through logical reasoning, just as physical attributes cannot be changed by thought alone.
In this quote, Stephen Fry illustrates the idea that emotions, such as cheerfulness, are not entirely under our rational control. Just as one cannot reason their way to physical changes—like growing taller—one cannot simply think positively to feel cheerful; happiness often relies on deeper, more intrinsic factors.
In practice
In a motivational speech about mental health, I would use this quote to emphasize the importance of emotional well-being beyond mere positive thinking.
I used many times to touch my own chest and feel, under its asthmatic quiver, the engine of the heart and lungs and blood and feel amazed at what I sensed was the enormity of the power I possessed. Not magical power, but real power. The power simply to go on, the power to endure, that is power enough, but I felt I had also the power to create, to add, to delight, to amaze and to transform.
To be human and to be adult means constantly to be in the grip of opposing emotions, to have daily to reconcile apparently conflicting tensions. I want this, but need that. I cherish this, but I adore its opposite too.
There comes a time when the blankness of the future is just so extreme, it's like such a black wall of nothingness. Not of bad things like a cave full of monsters and so, you're afraid of entering it. It's just nothingness, the void, emptiness and it is just horrible. It's like contemplating a future-less future and so you just want to step out of it. The monstrosity of being alive overwhelms you.
As someone who worked hard for a Labour victory in the 90s, do I regret it? Not really. It was bound to happen. And it'll happen with the next government, and the one after it. Because all governments serve us. They serve the filth.
It's now very common to hear people say 'I'm rather offended by that'.
You can't just say there is a God because well, the world is beautiful. You have to account for bone cancer in children. You have to account for the fact that almost all animals in the wild live under stress with not enough to eat and will die violent and bloody deaths. There is not any way that you can just choose the nice bits and say that means there is a God and ignore the true fact of what nature is.
You will never be happier than you expect. To change your happiness, change your expectation.
There is an hour wherein a man might be happy all his life, could he find it.
Knowledge of what is possible is the beginning of happiness.
The art of being happy lies in the power of extracting happiness from common things.
When your feeling down, do you know you can change it, like that. Put on a beautiful piece of music, start singing, that will change your emotion - or think of something beautiful, think of a baby, maybe one you love, really keep that thought in your mind, block out everything but that thought. I guarantee you'll start to feel good.
It sometimes strikes me how immensely fortunate I am that each day should take its place in my life, either reddened with the rising and setting sun, or refreshingly cool with deep, dark clouds, or blooming like a white flower in the moonlight. What untold wealth!
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