Secure a large mallet if possible, for this is the form of a Bible
hammer; if not possible use an ordinary one. Place this in line with
the other objects. Some people's hearts are harder than stone. It
takes a strong effort to break their hearts of iron. This is often
discouraging work. The hammer does not always work at the first blow.
It hits again and again, and if we who swing the hammer of the word
are faithful to the end the rock heart will at last break asunder;
God's word never fails.