He is the type of person who understands ten from hearing one.

He is exactly in the state of 'A frog in a well does not know the vast ocean.'

He spoke of his big dreams, saying, 'How can a sparrow understand the ambitions of a swan?'

He quoted the proverb 'Once a word leaves your mouth, you cannot chase it back even with the swiftest horse' to teach me to choose my words carefully.