disobeying the guru

Hrdayananda: (translating) He wants to know if the greatest offense is to
disobey the guru.
Prabhupada: Yes, that is the first offense. Guror avajna,
sruti-sastra-nindanam. Sruti-sastra-nindanam guror avajna. If you accept
guru and again disobey him, then what is your position? You are not a
gentleman. You promise before guru, before Krsna, before fire, that “I shall
obey your order; I shall execute this,” and again you do not do this. Then
you are not even a gentleman, what to speak about devotee. This is common
sense.
>>> Ref. VedaBase => Bhagavad-gita 2.11 (with Spanish translator) — Mexico,
February 11, 1975