Instead of aiming for direct assertions, storytelling, although it takes more time and effort, can be more effective.
Using public speaking as an example, starting with a story evoking an emotional connection with the audience is more convincing and engaging. With the lesson learned, the story not only makes its point but also creates a long-lasting memory.
There are times when stating a direct assertion serves the purpose, and there are times when showing, rather than telling, is the way to go.