To reach Truth by reason alone is impossible, because imperfect reason cannot study its own fundamental basis. Therefore the only way to study the mind is to get at facts, and then intellect will arrange them and deduce the principles. The intellect has to build the house; but it cannot do so without bricks and it cannot make bricks. Jnana-Yoga is the surest way of arriving at facts.
Music in which the notes follow each other in rapid succession holds the mind readily. A child loves lively music, because the rapidity of the notes gives the mind no chance to wander. A man who likes common music dislikes classical music, because it is more complicated and requires a greater degree of concentration to follow it.
Mind at a very low rate of vibration is what is known as matter. Matter at a high rate of vibration is what is known as mind. Both are the same substance; and therefore, as matter is bound by time and space and causation, mind which is matter at a high rate of vibration is bound by the same law.
People seem to forget that about ninety per cent of all our knowledge cannot be applied in a practical way to add to our material happiness or to lessen our misery. Only the smallest fraction of our scientific knowledge can have any such practical application to our daily lives.
If the soul is infinite and exists everywhere, as it must do, if it is a spirit, what is meant by its taking up bodies and passing through body after body? The idea is that the soul neither comes nor goes, neither is born nor dies. How can the omnipresent be born?