The rule of secrecy does not mean that he is never to talk about the Truth to others. It means only that he shall not talk prematurely about it. He must wait until he can talk with correct knowledge and at times when it is prudent to do so, and to persons who are ready for what he has to say. He must wait until he is himself strongly established in Truth, and will not be affected by the doubts and denials of others. He should learn and remember that speech opens his private purposes to their negative thoughts or antagonistic emotions and may thus weaken him. It needs firmness and discipline but by keeping his spiritual work and goals locked up inside himself and revealing them only when the right occasion arises he will show true practicality and foster real strength.
-- Notebooks Category 2: Overview of Practices Involved > Chapter 8: The Quest and Social Responsibility > # 61