At the present moment people are denying the existence of God, or they are thinking that God is dead. That means imperfection of knowledge. They have to still make progress to the perfectional point. And that test is to understand, "Here is God, and He is the fountainhead of everything." That perfection of knowledge you will have simply by reading... Any scripture you can read. The same conception is there. But in the Bhagavad-gītā it is more clearly explained so that you can understand with all reason, arguments, and scrutiny too. It is not dogmatic. That is the beauty of Bhagavad-gītā.
Just like in some dictionary the word is explained in one word. In some dictionary it is explained that "The history of this world is like this. This word can be explained like this, like that, like that," some pages like that. Similarly, so far dictionary, the small pocket dictionary is also dictionary, and that Webster's International big dictionary, that is also dictionary. The difference is that international dictionary, you get details of one word. Similarly, any scripture is perfectly giving direction towards understanding what is God. But actually how God is great, how He is working, how His laws are working, all these things you can find in the Bhagavad-gītā and Śrīmad-Bhāgavatam.