An example to others
The one who is a good example to others is often not the one who speaks eloquently in public. He may not be knowledgeable. He may not be clear eyed and fearless. Few will see him as a model for perfection.
We people prefer the person of talent: the sportsperson, the businessperson, the musician, the artist. For these not only have the regular attachments, but have some other-worldly power behind them as well. We adore what we feel is perfect for us.
Unfortunately, skill in any activity, be it poetry, sport, or speaking, is a result of much practice, and such practice has a cost: the cost is God. Any form of success that comes before a strong familiarity with the Infinite has been developed, boosts the ego to a level beyond control. From this position one is lost.
The true man of wisdom turns his back on talent: he is unbound. He loathes attachment as he would an unnecessary burden. However, old habits die hard, and the spiritual man suffers because of his wisdom. His suffering and insecurity often make him a poor and shaky public speaker. He spends so much time thinking of God, when it comes time to speak ... he has forgotten how. When he does manage a word or two he doesn't speak kindly, so few hear him.