The Buddhas, the Tathāgatas, teach only Bodhisattvas. All they do is for one purpose, that is, to show the insight of the Buddha to all living beings, to cause them to obtain the insight of the Buddha.
The Buddha speaks these words in Chapter Two of the Lotus Sutra. Here he emphasizes the importance of practice for reaching enlightenment. We may think that just hearing what the Buddha teaches is enough to reach his insight of seeing things for what they are. We also need to be actively engaged with the world, doing our best, making mistakes, and confident that we can continue to learn how to make things better. This is no different from the mistaken belief that one can learn how to cook by merely reading recipes. Only by going in the kitchen and making something can one gain the insight of whoever came up with the recipe.
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