The following is not an invitation which would be inclined to win or predispose people to accept it, and yet it was published in what would be called a Christian paper, an “official organ,” and then sent out on a postal-card. It reads, with the exception of the name, which we put in blank: “Don’t be a mud-turtle. A man or woman who will let the opportunity to hear —— —— pass unimproved, must belong to the mud-turtle family. Their aspirations do not rise above the grossly material instincts of the lower orders of life.” And yet there may have been many good people engaged in work so important that God could not give them time to leave it. The simple fact is that it would have been a physical impossibility for all to have heard, if every one had so desired and could have gone just as well as not. There are human limitations to a speaker, and dimensions to a crowd. The above invitation will serve as a model not to be followed.