Take a piece of wax, a piece of meat, some sand, some clay, and some wood shavings, put them on the fire and see how they react.
Each of them is being acted upon by the same agent, yet the wax melts, the meat fries, the sand dries up, the clay hardens, the wood shavings blaze.
Just so, under identical influence of circumstances and environment one man is made better, and he becomes stronger, and another becomes weaker, while another withers away.
This explains why one hears the Word of God and is made better. Still another hears the same thing and is made angry. Therefore, we realize that it is the make up of the heart that makes the difference.
via Graeber Road church of Christ