Those who can, do. Those who can’t, teach.

Anyone want piano lessons?

How did i survive my driving lessons?

(To be fair, my driving instructor is probably asking himself the same question. I literally could have gotten both of us killed on occasion.)

this maxim is utter bullshit

some of the very best practitioners have been esteemed teachers, and teaching improves any practitioner 

those who can’t, are scared to teach

As with many things, it’s bollocks if taken literally but has an interesting grain of truth. 

If you fully understand your subject, find it easy and natural (and hence you “can”) it is much harder to understand those who struggle with the same subject. Whereas those who didn’t find the subject matter easy are much more likely to empathise with learners and have alternative explanations if the first doesn’t work.

Being able to articulate your knowledge and experience to accelerate the understanding of others is just a different skill in the stack. Some absolute wizards are shit teachers, but you can't teach without knowing what you're talking about. 

One of the ways you can show a child is working at a greater depth is to get them to explain a concept to their peers. If they can "teach" it they understand it fully.

This is possibly the most insulting cliche peddled by the lawyer class, in a packed field. I know people who teach who are leaders in their field. Their studes benefit immeasurably from their ‘doing’. And yet the average solicitor - busy ‘doing’ from his desk - couldn’t teach someone to put a stamp on an envelope. When he’s not filing his timesheet by 6 minute units when he’s not dragging his paws along the ground. 

it’s generally inaccurate and corrosive - george bernard shaw?

he has some other gems:

”the hardest thing in the world is to persuade a woman that a bargain still costs money”

My favourite GB Shaw story is when he and his friends were bathing at the 40 foot in Dublin, a male only nudist area, a boat suddenly appeared and came very close to the shore and all the men covered themselves with their hats.  Except Shaw who covered his face.

When asked why he did this he said, "I don't know about you but around here I'm recognised by my face"

In my day they beat us around the head with sticks, corporal punishment wasn't banned in Ireland until the mid 80s and even then it was still allowed in private schools.