Although Kapiladeva is her son, Devahūti is begging the mercy of Kapiladeva so that by His mercy she could understand what is devotional service and how to approach Kṛṣṇa.
Guru is very confidential servant of Kṛṣṇa. Why confidential servant? Because he is canvassing door to door, "Please become Kṛṣṇa conscious. Please surrender to Kṛṣṇa." Kṛṣṇa says to Arjuna, sarva-dharmān parityajya mām ekaṁ śaraṇaṁ vraja (BG 18.66), and guru takes that very mission, but does not say like Kṛṣṇa, that "Your surrender to me." He says, "Surrender to Kṛṣṇa." One has to surrender to Kṛṣṇa through the via media of guru, directly. This is the process. Therefore guru accepts respects from the disciple not for his personal self, but conveying the respect to Kṛṣṇa. This is the process. Yasya prasādād bhagavat-prasādo yasyāprasādān na gatiḥ kuto 'pi **. If you cannot get the mercy of guru, then it is very difficult to approach Kṛṣṇa. We cannot approach Kṛṣṇa directly. Evaṁ paramparā-prāptam imaṁ rājarṣayo viduḥ (BG 4.2). That is the statement in the Bhagavad-gītā. Paramparā. Guru, he offers the same respect to his guru, his guru. It goes. In this way, it goes to Kṛṣṇa, paramparā system. Therefore it is stated, bhavad-anugrahāt. Bhavad-anugrahāt: "Please kindly become merciful upon me."
So in this way, one has to learn how to approach the Supreme Personality of Godhead. Our Vaiṣṇava system is ādau gurv-āśrayam. If we want to approach Kṛṣṇa, then in the beginning, ādau, the beginning is to take shelter of guru. That is being shown by Devahūti. Although He is son, (s)he is begging the mercy of Kapiladeva so that by His mercy she could understand what is devotional service and how to approach Kṛṣṇa. Tad etan me vijānīhi yathāhaṁ manda-dhīḥ. So this is very good qualification. Manda-dhīḥ: "My intelligence is not very sharp, manda." That is especially in this age. Of course, Kapiladeva and Devahūti was not in this age. Still, she is submitting because she happens to be woman, and although she is such exalted woman that she could give birth to the Personality of Godhead Kapiladeva—she was not ordinary woman—still, she thinks manda-dhīḥ: "I am less intelligence." Manda-dhīr hare: "My dear Kapila, You are Supreme Personality of Godhead, but I am manda-dhīḥ. My intelligence is not very sharp. Still, I want to understand the sublime subject matter, transcendental subject matter, from You. So it is possible." Bhavad-anugrahāt: "If You become merciful, then it is possible." This is the process.