A closed mouth gathers no foot. Generally speaking, you aren't learning much when your lips are moving.
Some days you are the dog, some days you are the tree.
If you lend someone £20 and never see that person again, it was probably well worth it.
Before you criticize someone, you should walk a mile in their shoes. That way, when you criticize them, you're a mile away and you have their shoes.
Never test the depth of the water with both feet.