New Defender's Study Bible Notes
6:1 too strait for us. It would seem that these prophets needed a larger “school” where they could study under Elisha for the prophetic ministry.
6:6 the iron did swim. This is another miracle of creation—not of matter, but of energy, analogous to Christ walking on the water. At the word of Elisha, spoken in faith, and to meet a special need, God created some kind of anti-gravitational force, superseding the law of energy conservation, enabling the iron axe-head to rise to the surface of the water.