New Living Translation
We are glad to seem weak if it helps show that you are actually strong. We pray that you will become mature.

American Standard Version
For we rejoice, when we are weak, and ye are strong: this we also pray for, even your perfecting.

Berean Study Bible
In fact, we rejoice when we are weak but you are strong, and our prayer is for your perfection.

Douay-Rheims Bible
For we rejoice that we are weak, and you are strong. This also we pray for, your perfection.

English Revised Version
For we rejoice, when we are weak, and ye are strong: this we also pray for, even your perfecting.

King James Bible
For we are glad, when we are weak, and ye are strong: and this also we wish, even your perfection.

World English Bible
For we rejoice when we are weak and you are strong. And this we also pray for, even your perfecting.

Young's Literal Translation
for we rejoice when we may be infirm, and ye may be powerful; and this also we pray for -- your perfection!

2 Corinthians 13:9 Additional Translations ...