This is actually very simple. Within your ability, if others ask you for help, try to help others. It's not within your own scope, but let the other person feel that you have tried your best to help him. The results no longer matter, what matters is how much you care about others. Another thing is to give what you deserve (not just material) to others. These words may sound grand, but they are all paving the way for you to gain favor from others in the future. So you have to identify the right person and don’t give away the favor in vain.