What makes the Gita a popular spiritual text is that it deals with a fundamental human problem...
The shirt is mithya, the cloth is satyam. That means the shirt is functionally valid but it does not have a reality apart from the cloth.
If you have chosen the appropriate actions, in keeping with dharma, and living the life of karma-yoga with prasada buddhi etc –we have covered this in earlier posts in this blog—there is no way you cannot gain this knowledge.
You can only choose between whether you make your pursuit inclusive of other things in life or exclusive. The fact remains that you need a mind free from the hold of raga and dwesha and you will get that only in a life of karma yoga