If joy were sunshine and sad was rain

and that was the only weather

I think people would understand

People love the sunny days

it’s when they can go and play

But if the sun never left

If the rain never came

Then creatures would fall victim to drought

And the world would fall apart

We need the rain

We need the sun

if the sun was always shining

And was the way it had always been

Assuming evolution did it’s job

To the animals

The sun would hold no meaning

To them, that’d be the way it's always been

As they would have never seen the rain

Because having joy without ever having sadness

makes the joy ordinary and dull instead of fun and great

We always want joy and we always want sunshine