What is the meaning of the statement that Uthman ibn Affan, may Allah be pleased with him, was the most knowledgeable of people in hadith, yet he was reluctant to narrate hadith because he was excessively modest? And does this mean that he did not speak in front of people with his eloquence due to his modesty?

Uthman ibn Affan, may Allah be pleased with him, was eloquent, articulate, and excellent in speech, but he was hesitant to speak. When he did speak, he would complete his discourse with the best phrasing and most eloquent expression. However, his nature was shyness and a disinclination to speak without a compelling reason. What indicates his eloquence is found in his sermons and admonitions.