Suppose a brother or sister is without clothes and daily food. If one of you says to him, "Go, I wish you well; keep warm and well fed," but does nothing about his physical needs, what good is it?
Imagine this scenario in reality.
A friend (note that it is a brother or sister) comes to your door. The friend is desperate. They are in need of food and clothing.
You calmly look at them, and with a smile that is filled with calmness, you say, "My friend, you have come to the right place. Here you will receive help. Please, depart both warmed and filled."
...then you shut the door.
Can you see how worthless the words are? Wouldn't you say that the person must not have even meant the words?