God is the friend of silence. See how nature -- trees, flowers, grass -- grow in silence; see the stars, the moon, the sun, how they move in silence... The more we receive in silent prayer, the more we can give in our active life. We need silence to be able to touch souls. The essential thing is not what we say, but what God says to us and through us. All our words will be useless unless they come from within.
You will only arrive at what you are aiming to achieve through the cultivation of two fundamental attitudes of soul. You must nurture a true love for what you represent, and also an insightful love of humanity. Be quite clear that if these two conditions are not met, you may be able to present material ever so logically, you may be able to demonstrate exceptional cleverness, and you will still not achieve anything.