The only known reference to the Law of Free Occult Obedience in the writings of Alice A. Bailey (AAB) and Djwhal Khul (DK). Links on these pages of the Laws of Alice A. Bailey are to the online books at the Lucis Trust website.
For a discussion of what AAB means by a “law” please see Alice A. Bailey – What is a Law?
For the majority, at present, the knowledge of the divine thought (as registered by disciples, as it works out in the emerging Plan, and as it gives livingness to life purpose) is reached through the Ashram. The Master imparts the nature of the Plan or the Purpose—according to the status of the initiate—and that is accepted by him under the Law of Free Occult Obedience. But the disciple or the initiate must not remain forever dependent upon the transmission of the divine thought to him by Those more advanced than he. He must learn to make his own contacts and to tap the “raincloud” for himself. He must—unaided—penetrate into the thinking processes (by permitted spiritual telepathy or impressibility) of Sanat Kumara.
You are welcome to post your comments and understanding of this law.