Whatever takes place quickly is not permanent.

I have heard that eastern loam is made
In forty days into a porcelain cup.
A hundred are daily made in Baghdad.
Hence thou seest also their price is vile.
A little fowl issues from the egg and seeks food
Whilst man’s progeny has no knowledge, sense or discernment.
Nevertheless the former attains nothing when grown up
Whilst the latter surpasses all beings in dignity and excellence.
Glass is everywhere, and therefore of no account,
But a ruby difficult to get, and therefore precious.