Just as a guest is always bashful in relation to the host who, with his wife, goes to the trouble of serving him, so should a person be bashful in relation to God - who bestows his goodness upon him, whose compassion overcomes Him, and who provides him with his daily sustenance – and not leave a hungry person until he has provided him with sustenance and bread.
This also suggests to us that when homeowner hosts a guest in his home he must receive him in joy and enthusiasm, and sit to eat with him at the same table as his children and household. As the Tannah [Mishnaic teacher] says, 'Let the poor be part of your household'; having him eat at his doorstep is so very foolish and shaming, certainly if he does not sit with him.