When the Meraglim all came with their complaints, Kalev was able to quiet them all down and strengthen them. We need to dig deep and recognize the yetzer hora for who he is, an expert at his job - and grow and accomplish and do our lifes shlichus. We have the Rebbe and we are more than able to do what we need to do! (Likkutei Sichos Chelek Ches, page 82)