Often we cannot see our anarthas ourselves. This is why it is important to associate with other devotees. What we cannot see is often obvious to other devotees; the other devotees act as a mirror to reflect our attachments. We have probably all experienced periods where we like what we see in ourselves, but often, when our words and behaviors are reflected back to us in the association of devotees, we see ourselves differently. We have probably also all had the experience of seeing our chief attachments - attachments to which we are usually blind-- in others. Ultimately we have to make ourselves susceptible or open to hearing from others if we wish to clear our hearts
Lectures from a disciple, Vol 1, "How can we see our attachments?", Pg 451 - 2nd Paragraph