The way one should react to those who are jealous or want to cause him harm is" not in kind, but with kindness" Those that trust in H'shem know they have nothing to fear and that everything even other's scorn comes from Him. 
pg 427

Nefesh Hachaim
Each person should serve H'shem to the best of his ability. To some this may be with his entire soul with others it may be with a little if that is truly all he has at the moment.
Gate Two, Chapter 15 pg 98