Authors:

At certain times, a silent mind is very important, but 'silent' does not mean closed. The silent mind is an alert, awakened mind; a mind seeking the nature of reality.

Thubten Yeshe, Lama Yeshe, Josh Bartok, Nicholas Ribush (2011). “When the Chocolate Runs Out”, p.133, Simon and Schuster
At certain times, a silent mind is very important, but 'silent' does not mean closed. The silent mind is an alert, awakened mind; a mind seeking the nature of reality.