A devotee, trying to excuse a mistake he had made, said to Srila Prabhupada, "I'm just a fool". Srila Prabhupad responded, "You should approach the spiritual master thinking yourself a fool, but it is not good to remain a fool after being instructed by him". On another occasion Srila Prabhupada said that as long as we think ourselves a fool before our guru then we will be alright, but as soon as we stop thinking ourselves a fool, then we are fallen.
Told by TKG