Of course ,every teacher and every book tells the aspirant to keep quite. But it is not easy to do so. that is why all this effort is necessary. even if we find somebody who has achieved this supreme state of stillness ,you must take it that necessary effort has been take in previous life. see what helped you to keep out of thoughts and adopt that for meditation.—- Maharishi Ramana.
Comment; it is very hard to be silent . meaning stillness of mind. according to maharishi it is very hard because we are too much attached to worldly affairs. if any time you tried it looks very hard. only our effort is necessary for this purpose. if you see anybody who has this quality you should think that he has done this practice in his previous life. because our real nature which is bliss ,which we can not say in languages but it comes in the absence of thoughts.