Sa evayam maya te dya yogah proktah puratanah
bhakto’ si me sakha ceti rahasyam hy etad uttamam
(Text 3, Ch 4, Transcendental Knowledge)
Meaning: That very ancient science of the relationship with the Supreme is today told by Me to you because you are My devotee as well as My friend and can therefore understand the transcendental mystery of this science.
*** Devotion and friendship are prerequisite for understanding science of the relationship with the Supreme.