11. mouth . . . open unto you—I use no concealment, such as some at Corinth have insinuated (2Co 4:2). I use all freedom and openness of speech to you as to beloved friends. Hence he introduces here, "O Corinthians" (compare Php 4:15). The enlargement of his heart towards them (2Co 7:3) produced his openness of mouth, that is, his unreserved expression of his inmost feelings. As an unloving man is narrow in heart, so the apostle's heart is enlarged by love, so as to take in his converts at Corinth, not only with their graces, but with their many shortcomings (compare 1Ki 4:29; Ps 119:32; Isa 60:5).

     12. Any constraint ye feel towards me, or narrowness of heart, is not from want of largeness of heart on my part towards you, but from want of it on your part towards me.