Helpfulness refers to the state of being helpful. Every single person on earth needs to try and improve their helpfulness, this would make society a much better place. If you have a can that you need to open then the helpfulness of a can opener may be invaluable, especially if this is the only thing you have to open the can with. Sometimes your helpfulness may be a simple smile or holding the door for someone when you are entering a business.
The spirit of brotherhood recognizes of necessity both the need of self-help and also the need of helping others in the only way which every ultimately does great god, that is, of helping them to help themselves