We inhabbit vessels which carry our contiousnous. They are our extention to the world around us and to others. Th body is a home to the spirit, and as such, we should do our best to keep the body healthy. A disciplined mind leads to a healthy body.
We are all moving spirits, interacting with oneanother. Be friendly and helpful to those in your community, and they will have reason to return the favor. Kharma is receiving back what we give to the world.
All actions should have a reason. Without a reason, an action serves no purpose. To take a life without meaning is a sin, and will be returned back through kharma. To feed yourself or for self defense are acceptable, and with just cause, many things can be reasonable. Cruelty and malevolence are not.