The beginning of wisdom is the definition of terms.
The wise man does at once what the fool does finally.

The more I read, the more I acquire, the more certain I am that I know nothing.

The journey of a thousand miles begins with a single step.
The only true wisdom is in knowing you know nothing.

Honesty is the first chapter in the book of wisdom.
A wise man learns more from his enemies than a fool from his friends.
The fool doth think he is wise, but the wise man knows himself to be a fool.
The invariable mark of wisdom is to see the miraculous in the common.
The wise man knows that he knows nothing, the fool thinks he knows all.

It is what we know already that often prevents us from learning.
To attain knowledge, add things every day. To attain wisdom, remove things every day.