Ye are not straitened in us, but ye are straitened in your own bowels.
Any constraint ye feel is not from want of largeness of heart on my part toward you, but from want of it on your part toward me.
Not straitened in us - i:e., for want of room in our hearts to take you in.
Bowels - i:e., affections (cf. 2 Corinthians 12:15).