From the Sacred Text of the Universal White Brotherhood: One’s Place in Nature, Part 1 of 2

Someone could have been asking for knowledge for a long time; and finally, He would send a Spiritual Teacher to that person, and He would implant the Spirit in this Teacher, so that He could manifest Himself, to deliver what is needed. This is to say, that everything given to you in an instance requires you to be so prudent - to discern whether it comes from God and, without opposing or contradicting it, to immediately receive it. If it does not come from God, i.e. from this real, objective, Divine world, do not receive it.