Devotionals are probably the shortest items you will write. They are normally only 250 words long, although some range up to 400 words. In books, they can be as long as 600 words. Devotionals are concise and to the point. There is no room for unnecessary words.
If devotionals are well written, they can help a variety of people who have different concerns and needs. Each individual will draw something different from the same meditation. You achieve universal appeal by keeping your examples general enough so a wide variety of people can identify with them. The Bible does this, which is one reason we all benefit from our daily Bible reading time. Plus, the same devotional may strike one individual in totally different ways at various times in his life, depending on the current circumstances at a given moment. So try hard to make your devotionals deep and broad-based.