So Kṛṣṇa's opulence, beauty, strength, and so far wisdom, at least you can test. Now the wisdom, see preliminary wisdom only. Preliminary talks on spiritual matter is discussed in this Bhagavad-gītā. And this book is still read, even after five thousand years, all over the world. Just see His wisdom. That is a test. Big scholars, big religionists, philosophers, they are bewildered still about Bhagavad-gītā. Therefore there are so many interpretations. But this, what is this Bhagavad-gītā? Bhagavad-gītā is the A B C D of spiritual knowledge. It is not very high depth of spiritual knowledge. High depth of spiritual knowledge is in the Srimad Bhagavatam. This is only entrance. Just like children are taught a b c d., or first book of knowledge. It is only the first book of knowledge.