Once a chassid stood contemplating the minyan (prayer quorum) his
rebbe had assembled to pray on behalf of a sick man.
The chassid was upset. The quorum
included ruffians, burglars and other people of ill repute. The
chassidic master felt his disciple's discomfort, and explained to him:
"We need these people in our minyan. When you need to open the gates
of Heaven, you had better get help from experts....!"