A Definition of Sinat Chinam from Rav Zev Leff

Don't think evil in your heart about your neighbor.  Don't look at your neighbor's shortcomings look at his strengths.

If there is no emes and Shalom there is no Beis Hamikdash.

from a Shiur on Kosher Tube:
67 - Rav Leff - Tisha B'av Night 5767 (2007 - Part 1 of 5)
http://koshertube.com/videos/index.php?option=com_seyret&Itemid=4&task=videodirectlink&id=2626