2 Corinthians 10:10

For they say "His letters are authoritative and forcible, but his personal presence is unimpressive, and as for eloquence, he has none."

1 Corinthians 1:17

Christ did not send me to baptize, but to proclaim the Good News; and not in merely wise words--lest the Cross of Christ should be deprived of its power.

2 Corinthians 11:6

And if in the matter of speech I am no orator, yet in knowledge I am not deficient. Nay, we have in every way made that fully evident to you.

Galatians 4:13-14

And you know that in those early days it was on account of bodily infirmity that I proclaimed the Good News to you,

1 Corinthians 1:21

For after the world by its wisdom--as God in His wisdom had ordained--had failed to gain the knowledge of God, God was pleased, by the apparent foolishness of the Message which we preach, to save those who accepted it.

1 Corinthians 2:1-4

And as for myself, brethren, when I came to you, it was not with surpassing power of eloquence or earthly wisdom that I came, announcing to you that which God had commanded me to bear witness to.

2 Corinthians 10:1

But as for me Paul, I entreat you by the gentleness and self-forgetfulness of Christ--I who when among you have not an imposing personal presence, but when absent am fearlessly outspoken in dealing with you.

2 Corinthians 12:5-9

Of such a one I will boast; but of myself I will not boast, except in my weaknesses.

Treasury of Scripture Knowledge

Summary

For his letters, say they, are weighty and powerful; but his bodily presence is weak, and his speech contemptible.

Bible References

Say they

2 Corinthians 10:11
Let such people take this into their reckoning, that whatever we are in word by our letters when absent, the same are we also in act when present.

But

2 Corinthians 10:1
But as for me Paul, I entreat you by the gentleness and self-forgetfulness of Christ--I who when among you have not an imposing personal presence, but when absent am fearlessly outspoken in dealing with you.
2 Corinthians 12:5
Of such a one I will boast; but of myself I will not boast, except in my weaknesses.
1 Corinthians 2:3
And so far as I myself was concerned, I came to you in conscious feebleness and in fear and in deep anxiety.
Galatians 4:13
And you know that in those early days it was on account of bodily infirmity that I proclaimed the Good News to you,

And his

2 Corinthians 11:6
And if in the matter of speech I am no orator, yet in knowledge I am not deficient. Nay, we have in every way made that fully evident to you.
1 Corinthians 1:17
Christ did not send me to baptize, but to proclaim the Good News; and not in merely wise words--lest the Cross of Christ should be deprived of its power.
1 Corinthians 2:1
And as for myself, brethren, when I came to you, it was not with surpassing power of eloquence or earthly wisdom that I came, announcing to you that which God had commanded me to bear witness to.

General references

1 Corinthians 1:27
But God has chosen the things which the world regards as foolish, in order to put its wise men to shame; and God has chosen the things which the world regards as destitute of influence, in order to put its powerful things to shame;
1 Corinthians 2:3
And so far as I myself was concerned, I came to you in conscious feebleness and in fear and in deep anxiety.