Sometimes the gemara (or a braysa) will say something and then give a mashal (parable) to explain the true intent of what was previously said. Why does the gemara do this? Why not simply make the original point clear so it does not have to end up adding to, or modifying the original point?
[Note: We could divide mashalim into two categories. 1- those brought by the original speaker and 2- those brought by a different person. I'm really asking about mashalim brought by the original speaker.]