Guard your heart above all else,
for it determines the course of your life.
Note that Jesus speaks of the pure in heart. The word “heart” in the Bible usually means that part of man’s mentality which modern psychology knows under the name of the “subconscious mind.” This is exceedingly important because it is not sufficient for us to accept the Truth with the conscious mind only. At that stage it is still a mere opinion. It is not until it is accepted by the subconscious mind, and thus assimilated into the whole mentality, that it can make any difference in one’s character or life. “As a man thinketh in his heart, so is he.” “Keep thy heart with all diligence, for out of it are the issues of life.”
Most people, and learned people especially, have all kinds of knowledge that does not in the least affect or improve their practical lives. Doctors know all about hygiene, but often live in an unhealthy way, notwith- standing; and philosophers, who are acquainted with the accumulated wisdom of the ages, and assent to most of it, continue to do foolish and stupid things in their own personal lives, and are unhappy and frustrated in consequence. Now, knowledge such as this is only opinion, or head knowledge, as some people call it. It has to become heart knowledge, or to be incorporated into the subconscious, before it can really change one. The modern psychologists in their efforts to “re-educate the subconscious” have the right idea, though they have not yet discovered the true method of doing so, which is by scientific prayer, or the Practice of the Presence of God.