Dada Bhagwan said this quote

What is the definition of Gnan [true knowledge]? It is that which must be present without fail when needed. Who should be the one imparting this Knowledge? It is not acceptable coming from any ordinary person. It must be from one whose speech has power (vachanbad), so that it will be present when needed. The Gnan [Knowledge] has to present itself, otherwise the work cannot be accomplished.