Who hasn’t seen the image of the three monkeys with their hands covering their eyes, ears, and mouth, representing, "See no evil, hear no evil, speak no evil”? It seems self-explanatory—don’t look upon, listen to, or speak of “evilness,” yet how does one go about accomplishing this?

Good advice—but I believe there’s a deeper meaning, which Cayce points to in a reading he gave for himself.

The reading starts by analyzing the influences affecting Cayce from previous lifetimes. But then it suddenly takes a leap into the ultimate issue we all face—the need to heal and regenerate. Earlier in the reading, it explains the original sin Cayce committed, self-reliance, to his detriment (and to ours):

Reading 294-183

So, the entity found self without the strength in the abilities of self to maintain that at-oneness; for he had come to depend rather upon the abilities of self—which is too oft the undoing of a soul!

It’s at this point that the reading lays out what we must do to restore the presence of our eternal, vital selves.

The next passage is continuous, but I have inserted comments along the way.

Then, as to how the entity—as an entity—may regenerate or re-purify the body-physical from those experiences:
[Okay, listen up; this is how we do it—how we heal our life and our physical body.]

This is a matter of form by consecration of the Mind, the Soul, the Body,
[we need to dedicate and commit ourselves completely]

to the Creative Forces
[to God]

that may manifest through each and every soul
[universally accessible]

that has and does put on the whole armor of a risen Lord.
[not the flawed appearance of the lifeless body of the crucified Jesus and limiting ourselves as “mere mortals” —but the omnipotent, transformed, authentic Being that He is, dropping our illusions and accepting His call to follow in His footsteps]

For HE hath shown the way;
[by example, He’s demonstrated how to do this already]

not by some mysterious fluid, not by some unusual vibration,
[no tricks up His sleeves, no secret or magic password we must discover]

but by the simple method of living that which is life itself.
[a simple process, and wholly life affirming—though not necessarily easy]

Think no evil; speak no evil; hear no evil.

Here’s the answer. The method is explained in that one sentence; look closely. The reading has changed the usual “see no evil” to “think no evil”! Why? Because the change of that one word reveals the underlying problem in how we usually live. You can’t see evilness unless you first think it and judge it as such.

Thinking is what we do privately, all by ourselves—but devoid of divine insight and guidance. Just as it was stated earlier in Cayce’s reading, we have come to depend on our own abilities, our own best thinking, to guide us. We are taught this early on; this is what an adult does.

We decide, by ourselves, what is going on, what is right, and what is wrong; we decide what we say, and when we say it; and we interpret what we hear as well. Our actions or, rather more accurately, our re-actions, are then based on our own interpretations; we’re very good at playing judge, jury, and executioner.

Thinking is what the “original sin” was that led to the “fall”—or our attempt to separate ourselves from our Source, as we played at being God. We started thinking for ourselves instead of using God’s eyes and ears. God doesn’t think, God Knows, and we come to “know” when we listen. It’s like being joined with God in a perfectly coordinated dance—with God leading.

And as the Truth flows as a stream of life
[as God’s revitalizing, loving vision moves]

through the Mind in all its phases or aspects, and purifies same,
[through us, replacing our thoughts, judgments and memories about the past, present, and future with His loving Truth and reality]

so will it purify and revivify and rejuvenate the body.
[It will cleanse our minds, and we will abandon the bondage of erroneous and distorting beliefs about ourselves and others, allowing our bodies to reconfigure, effortlessly, and reflect how God created us—perfect in every way.]

This line from the reading is not in order but was saved for last:

It is ever set before each and every soul. In Him put thy trust, and not in the strength of thine own mind, nor of thine associations in a material world, nor of thine affiliations in this or that experience; but rather in Him.

We can be under the influences of past lives or current events, or choose instead to be under His influence. We will understand what needs to be done—or not—in every moment. We will be shown the truth of every experience if we don’t think, but ask, and then listen for His word. 

It's simple, just not always easy.