From a letter of the previous rebbe to a chief rabbi:
Fighting evil is a very noble job. But it is not your mission in life.
Your job is to bring in more light.
Stay completely out of such battles, arguments, and debates.
Not because you aren't able to win. Not because your heart is too delicate to go to war.
But because every bit of your energy needs to be dedicated...
Fear not a sudden terror, nor the ruin of the wicked when it comes. [They may] take counsel together, and it shall come to naught; speak words, and it shall not stand; for G-d is with us.