Kṛṣṇa said to Arjuna, sa kāleneha yogo naṣṭaḥ parantapa (BG 4.2): "In due . . . in course of time, that paramparā system has been lost, or broken. Therefore," Kṛṣṇa said: "I am speaking the old truth unto you so that you begin the paramparā system again." So we have to accept Bhagavad-gītā by the paramparā system.
Even the old system is broken, still, it is existing because Kṛṣṇa is speaking to Arjuna, and we have to understand Bhagavad-gītā as Arjuna understood. Then you are in the paramparā. And if you understand Bhagavad-gītā as some so-called scholar understands, then you are not understanding Bhagavad-gītā—you are understanding something nonsense, wasting your time. This is the fact.
If you try to understand Bhagavad-gītā as Arjuna understood . . . that is not difficult. Arjuna's understanding is there in the Bhagavad-gītā. So if you follow the footprints of Arjuna, then you are rightly understanding Bhagavad-gītā. But if you are following the footprints of some rascal, then you are not understanding Bhagavad-gītā; you are understanding something else.
This is the secret. Here we have got so many commentaries on Bhagavad-gītā, as one thinks. As if Kṛṣṇa left Bhagavad-gītā to be commented by some rascals to understand. Why? He said Bhagavad-gītā clearly. Why it is to be interpreted by some rascals? Did Kṛṣṇa mean that "I leave Bhagavad-gītā ambiguous and some learned scholar will come. He will explain"? What is this nonsense? Everything is clear.