Summer is bright, lush, and full of passions, even the heat is nearly intolerable.
But some don't like it, because it's too green, it's too noisy, and it's a world filled up completely. After all, we need empty spaces. When our brains are full, we are stuck there, difficult to learn new stuff. When out stomach is full, we must take care and move slower.
This is the reason why we need autumn.