This lesson deals with the fourth answer to the thought life problem - if the thought life is the accumulation of data from birth, that means we should guard it from birth. We should guard what we expose ourselves to continually.

Here are some basic areas of purifying the heart.

- Prevention: The case for innocence.

- Precaution: What you see is what you get. That is the principle of guarding the eyes. What we look at must be controlled at any cost.

- The business of making a decision on a minute-by-minute basis.