When we read the Gita thoroughly, and especially when we look through the commentaries of our acaryas, we see that there are five levels of instructions in Bhagavad-gita. First, there are general instructions for everyone. After this is secret (guhya), then more secret (guhyatara), then most secret (guhyatama), and finally the most secret of all secrets (sarva-guhyatama). These instructions are not given in an expanded form, but in the form of condensed verses (sütras).
 
 
Gaudiya Vedanta Publications