Silence is the language of Om. We need silence to be able to reach our Self. Both internal and external silence is very important to feel the presence of that supreme Love.
Om is not just a sound or vibration. It is not just a symbol.... If you think of Om only as a sound, a technique or a symbol of the Divine, you will miss it altogether. ..... Om is the mysterious cosmic energy that is the substratum of all the things and all the beings of the entire universe. It is an eternal song of the Divine. It is continuously resounding in silence on the background of everything that exists.
Penetrate deep into the word "Om". Gradually the word will disappear and only the silence will remain. The word is a support. The meaning is within you. Om brings out that meaning which is hidden in your soul.