In Luke's gospel we are being asked to make an option for the poor. Instead of asking people to luncheon who can repay us in kind, Luke points out that we should invite "the poor, the crippled, the lame, and the blind." These people will be unable to repay our kindness but our reward will come when we die. Jesus always took particular care of down-trodden people and so should we too, if we are in a position to do so. It seems to me that we should just choose to do kind and charitable deeds and disregard any reward. If we get one in the next life it is a bonus. We can never really know the mind of God, for we read in Romans "O the depth of the riches and wisdom and knowledge of God! How unsearchable are his judgments and how inscrutable his ways." So instead of calculating what the response might be from God, we should just try to assist people that need our help and try to make a difference in their lives. Surely it is enough to know that we have been able to lighten the load for someone, and if our motives are good then God will know this.