All the scriptures are meant only to make a man retrace his steps to his original source. He need not acquire anything new. He only has to give up false ideas and useless accretions. Instead of doing this, however, he tries to grasp something strange and mysterious because he believes his happiness lies elsewhere. That is the mistake.
Mouna (silence) is the best and the most potent diksha. That was practiced by Sri Dakshinamurti. Initiation by touch, look, etc., are all of a lower order. Silent initiation changes the hearts of all.