Interestingly enough Blavatsky was speaking things which even nowadays are sounding mysterious and somewhat tangling to ears. But that is the case when you mix truth with lie. A lie itself can not bear the load but when mixed with a bit of truth then it can pass... the more of the truth in some lie and voila! People listen. Also this pops in me as a question; we as humans have in our very core a writing of truth and we resonate with it, on high frequency. A lie is totally opposite frequency and does not resonate with human. BUT when you mix lie with truth ,the more truth you pour in lie ,more the people will open their ear to hear what you actually speak. Their sensors are beeping that something is wrong when a lie is mixed with truth but this new mixture has a part of truth in it so we consciously say:"nah- gotta be the truth...it sounds well..."But still unconsciously we detect even a 00000.1 % lie !
That was a divine gift to a man from creator. Sadly we do not use it often today.