Labour not to be rich

Proverbs 23:4-5
King James Version (KJV)

4 Labour not to be rich: cease from thine own wisdom.

5 Wilt thou set thine eyes upon that which is not? for riches certainly make themselves wings; they fly away as an eagle toward heaven.

Do not overwork to be rich

Proverbs 23:4-5
New King James Version (NKJV)

4 Do not overwork to be rich;
Because of your own understanding, cease!
5 Will you set your eyes on that which is not?
For riches certainly make themselves wings;
They fly away like an eagle toward heaven.

What is of your own understanding?

Overworking