Guru and devotees

Do not claim to know everything

Speak from what you have learned and say so when you do not know. Leave room to learn from others.

A devotee who thinks he knows it all has stopped learning. If you are asked something you are not sure about, say so, and ask someone who knows. It is easier on the listener and on you.

Whose teaching
Bhakti Charu Swami
Where it is taught
Bhakti Charu Swami on the behavior of a Vaiṣṇava
Source
ISKCON Desire Tree
Do not claim to know everything · HariHariBol