It is not all gold that glareth

For gold in phisik is a cordial; Therefore he lovede gold in special.

And yet he hadde "a thombe of gold" pardee.

Every honest miller has a golden thumb.

That if gold rust, what shall iron do?/ For if a priest be foul, in whom we trust,/ No wonder is a lewd man to rust.

If gold rusts, what then can iron do?