William Burkitt on 1 Corinthians 2:3

Observe here, 1. How the apostle declares that his person was suitable to his preaching, both plain, neither pompous. 2Cor 10:10 He tells us, That his bodily presence was weak and mean, and his speech contemptible. Tradition tells us, that Paul (according as his name signifies) was a man of a very little stature, his voice small, and wanting that presence which some others had.

Observe, 2. Some pain that the apostle was in, fearing lest the infirmity of his flesh should render him as a minister despicible in the eyes of any, or the course of the gospel be hindered and obstructed by his bodily infirmities; for this was he with them in fear and much trembling. Nothing doth so much affect and afflict the ministers of Christ, as an apprehension and fear lest any thing in or from themselves should obstruct or hinder the success of the gospel which they teach. It is sad when our poverty or mean appearance, to despise our message, or from any natural imperfections found with us; but much sadder, when such moral blemishes are found with us, as to render us the occasion of our own contempt, and the cause of our ministry's unsuccessfulness.