It is the duty of Christians to be settled in the doctrine of faith. It is the apostle’s prayer, I Peter 5:10, “The God of all grace establish, strengthen, settle you.” That is, that they might not be meteors in the air, but fixed stars. The apostle Jude speaks of “wandering stars”, in verse 13. They are called wandering stars, because, as Aristotle says, “They do leap up and down, and wander into several parts of the heaven; and being but dry exhalations, not made of that pure celestial matter as the fixed stars are, they often fall to the earth.” Now, such as are not settled in religion, will, at one time or other, prove wandering stars; they will lose their former steadfastness, and wander from one opinion to another.
Thomas Watson (1620 – 1686)