I've often written that Ana is one of my greatest teachers.

Threat of boredom is the greatest teacher in the world.

Al Gore often referred to her as his "greatest teacher".

I have absorbed years of instruction from the greatest teachers.

With a thirst for knowledge, she learned from the greatest teachers in the land.

She's also the greatest teacher in a school of great teachers.

And for his efforts he was called the greatest teacher of acting in the English-speaking world.

Experience may not be the greatest teacher, but it is a great tyrant.

As any parent will tell you, children are our greatest teachers.

They only worship him as one of their greatest teachers.