A person must learn to be alone in solitude, to listen in one's heart to the wordless speech of the Spirit, and to discover the truth bout oneself and God. Then their word to others will be a word of power, because it is a word of silence.
And, from Mother Teresa:
God is the friend of silence. We need to find God
But we cannot find God in noise, in excitement.
See how nature, the trees, the flowers, the grass
Grow in deep silence ... the stars, the moon and the sun
Move in silence ...
The fruit of silence is prayer. The fruit of prayer
Is faith. The fruit of faith is love.
The fruit of love is service ...
(The fruit of service is peace.)