When you enter the Heart, you become the Heart. That is the true silence.
A man asked the Maharshi to say something to him. When asked what the man wanted to know, he said that he knew nothing and wanted to hear something from the Maharshi. Bhagavan then said to the man, “You know that you know nothing. Find out that knowledge.” (See Talk 12 in “Talks with Sri Ramana Maharshi).
Bhagavan used to say that the only direct knowledge we have is that “I Exist”. All other knowledge is via inference. Hence the Self-Inquiry, “Who Am I?” was advised by Bhagavan as the primary spiritual practice.