Jeremiah 12:5 (b) This is a picture of the predicament of one who is weary and disgusted with the type of Christianity that he sees around him. Since his distress in the midst of such a weak form of holiness is so great, he would be miserable indeed if he were brought into a situation where holiness abounded, godliness predominated, and the Holy Spirit is working in power. One who is made miserable by the Christians on earth would be far more miserable if he were in Heaven where the highest form of pure Christianity prevails.
2 Corinthians 12:20 (a) No doubt this refers to the boasting of man in religious circles who are puffed up with their own importance, but who have really nothing substantial to offer. These are clouds without water, and wells that are dry.
2 Peter 2:18 (a) The reference evidently is to the boastful language used by great religious leaders whose tongues are larger than their hands. They talk much, and do little. They boast of great things, and produce only wind. (See also Judges 1:16).