The twelfth sutra:

Inquire of the inmost, the one, of its final secret, which it holds for you through the ages.

The great and difficult victory, the conquering of the desires of the individual soul, is a work of ages; therefore expect not to obtain its reward until ages of experience have been accumulated. When the time of learning this twelfth rule is reached, man is on the threshold of becoming more than man.
The knowledge which is now yours is only yours because your soul has become one with all pure souls and with the inmost. It is a trust vested in you by the most high. Betray it, misuse your knowledge, or neglect it, and it is possible even now for you to fall from the high estate you have attained. Great ones fall back, even from the threshold, unable to sustain the weight of their responsibility, unable to pass on. Therefore look forward always with awe and trembling to this moment, and be prepared for the battle.

Inquire of the inmost, the one, of its final secret, which it holds for you through the ages. Only on the periphery are we many; only on the circumference does the multiplicity exist. The more we move toward the center, the more we move toward the one. The center is one.

On the periphery we exist as many. Your personality is different from the personality of your neighbor. Your individuality is different from anyone else. But your innermost center is not different. Your innermost center is the innermost center of all. When you reach the innermost, you reach to the one.

The whole world is just the circumference. The center – you may call it God or you may call it the supreme soul or whatsoever you like – but when you reach your own innermost center, you have reached the innermost center of all. And there, in that one, all secrets are hidden. And there, all the mysteries can be revealed to you.

You cannot know them beforehand. Unless you enter the innermost temple of the one, mysteries will remain mysteries. You can create many theories about them and many philosophies of no use, futile, meaningless. You can philosophize much, but nothing can be concluded. It has happened for ages. Centuries have passed and men have been philosophizing, creating thousands and thousands of philosophies, theories and systems with no result. You can create them, but it is mental: you don’t know.