His purpose of this concept is that we, as readers, find the meaning somewhere in between the two extremes. In The Clod and The Pebble the clod and pebble represent two extremes of the idea of love. The clod is all-giving and selfless in love. The pebble portrays the exact opposite idea of love than the clod. The pebble is all-taking and selfish.
Love is a little give and a little take.
Blake invites us to think about the truth lying between the opposites. Blake not only leads us to see that the truth is an activity and the form it takes is not in a statement, but somewhere in the middle of both, but he also illustrates the union of opposite, contradicting things. Blake may be considered very weird to his audience. His works may appear simple, yet they are complex. He seems to present a continued duality in his works.