Silence is the measure of the power to act

A friend sent this today. Very profound, in my opinion.

Silence is the measure of the power to act; that is, a person never has more power to act than he has silence. Anyone can understand that to do something is far greater than to talk about doing it. If, therefore, a person has a plan or idea and is fully resolved to carry it out, he does not need to talk about it. What he talks about in connection with the proposed action is what he is most unsure of and most unwilling to do.

Soren Kierkegaard, in Provocations