There is a reason why feelings are described in terms of weight.

Light emotions are feelings with little internal ‘mass’; they exist brightly for a moment in your psyche like a bird resting momentarily on a branch before it lifts its wings and is gone. It’s light, hard to hold, and easily spooked.

Amusement, joy, inspiration, awe, gratitude, and serenity are light emotions with strength, but no mass. Nobody ever reports feeling ‘stuck’ with these feelings, because they’re just passing through, like a bird on a wing, it just flew away, somewhere.

Heavy emotions are, by comparison, like elephants, not going anywhere fast, but still crushing anything underfoot.

Sadness, regret, disappointment, anger, guilt, and loathing are heavy emotions with a great degree of internal mass. They’re no stronger than the light feelings, but they don’t ‘go away’ on their own;  they dominate the emotional landscape, and can only be shifted with more energy than is available on an ordinary day.