Man is like a tree. His heart, not his will alone, is the root. There is no possible way by which the will can choose to produce fruit contrary to the character of the root. If the root is bad, the tree is bound by its very nature to produce evil fruit. Man is like a person standing alongside his treasure chest. There is no possibility of bringing pure gold out of a box filled only with rusty steel. The contents of the heart determine what words and deeds may be brought out. Far from being neutral, the will must reach into the heart for its choices. Every thought, word and deed will partake of the nature of the treasure within. Man is like a stream which cannot rise above its source. If the fountain is polluted, the outflow will be evil. If the source be sweet, the stream will not be bitter and cannot choose to be so.
– From Man’s Will Free Yet Bound by Walter Chantry