20. But since that on which the thought in the mind of another rests is not objective to the thought-reader's consciousness, he perceives the thought only, and not also that on which the thought rests.

The meaning appears to be simple: One may be able to perceive the thoughts of some one at a distance; one cannot, by that means alone, also perceive the external surroundings of that person, which arouse these thoughts.

21. By perfectly concentrated Meditation on the form of the body, by arresting the body's perceptibility, and by inhibiting the eye's power of sight, there comes the power to make the body invisible.

There are many instances of the exercise of this power, by mesmerists, hypnotists and the like; and we may simply call it an instance of the power of suggestion. Shankara tells us that by this power the popular magicians of the East perform their wonders, working on the mind-images of others, while remaining invisible themselves. It is all a question of being able to see and control the mind-images.

22. The works which fill out the life-span may be either immediately or gradually operative. By perfectly concentrated Meditation on these comes a knowledge of the time of the end, as also through signs.

A garment which is wet, says the commentator, may be hung up to dry, and so dry rapidly, or it may be rolled in a ball and dry slowly; so a fire may blaze or smoulder. Thus it is with Karma, the works that fill out the life-span. By an insight into the mental forms and forces which make up Karma, there comes a knowledge of the rapidity or slowness of their development, and of the time when the debt will be paid.

23. By perfectly concentrated Meditation on sympathy, compassion and kindness, is gained the power of interior union with others.

Unity is the reality; separateness the illusion. The nearer we come to reality, the nearer we come to unity of heart. Sympathy, compassion, kindness are modes of this unity of heart, whereby we rejoice with those who rejoice, and weep with those who weep. These things are learned by desiring to learn them.

24. By perfectly concentrated Meditation on power, even such power as that of the elephant may be gained.

This is a pretty image. Elephants possess not only force, but poise and fineness of control. They can lift a straw, a child, a tree with perfectly judged control and effort. So the simile is a good one. By detachment, by withdrawing into the soul's reservoir of power, we can gain all these, force and fineness and poise; the ability to handle with equal mastery things small and great, concrete and abstract alike.

25. By bending upon them the awakened inner light, there comes a knowledge of things subtle, or concealed, or obscure.