Knowing ignorance is strength.
Ignoring knowledge is sickness.
Only when we are sick of our sickness shall we be free from the disease.
The sage is free from the disease but he recognizes it.
This is the secret of his health.
As I Understand It:
Not being an intellectual (a person whose rational thinking is cut-off from intuitive feeling) is strength. Ignoring the knowledge of Tao is unhealthy.
Sickness is being out of balance with the Tao. The Tao is kindness, contentment and patience. The non-Tao thinking expresses itself in sickness. Sick mind results in sick body. Only those who are sick of sick thoughts stay healthy. They may feel pain, they may hurt but they do not suffer. Pain and hurt are natural phenomenon but suffering is a personal choice.
Mental as well as physical difficulties originate from negative thoughts. While destructive pursuits weaken the body, positive and creative quests heal it. The secret of total well-being is a happy mind.
Dyer, W. Wayne. Change Your Thought–Change Your Life: Living the Wisdom of the Tao. Hay House, Inc. 2007.
The Way of Lao Tzu (Tao-te Ching), Translated, with introductory essays, comments, and notes by Chan, Wing-Tsit. The Bobbs-Merrill Company, Inc. 1963.