But think well over it and you will. M. means here, that they have no right or even power to go against the natural or that work which is prescribed to each class of beings or existing things by the law of nature. The Brothers, for instance could prolong life but they could not destroy death, not even for themselves. They can to a degree palliate evil and relieve suffering; they could not destroy evil. No more can the Dhyan Chohans impede the work of the Mamo Chohans, for their Law is darkness, ignorance, destruction etc., as that of the former is Light, knowledge and creation. The Dhyan Chohans answer to Buddh, Divine Wisdom and Life in blissful knowledge, and the Ma-mos are the personification in nature of Shiva, Jehovah and other invented monsters with Ignorance at their tail).
The last phrase of M.'s I translate is thus. Tell him (you) then that for the sake of those who desire to learn and have information, I am ready