首楞嚴義疏注經 4.142

4.142

悟人，善友也。指示，教行也。令悟，十方如來也。滿慈於法有疑，於喻明解，故佛舉喻以問，令解法如喻。

The awakened person is a good friend. Pointing it out is teaching and practice. Causing him to awaken is the tathāgatas of the ten directions. Pūrṇa Maitrāyaṇīputra had doubts regarding the Dharma, but had a clear understanding regarding the analogy; therefore the Buddha posed the question through the analogy to make him understand that the Dharma is like the analogy.