Knowledge and Common Sense

4 great scholars, Learnt all the Vedas, Each one had a talent, One could assemble all bones, The other could supply, Skin,flesh and blood, The third knew How To make it alive. The fourth one was not As good as the other three. They all went through a forest, They saw on the way, The bones,skin and the remnants, They wanted to test their skill. The 4th one asked them to wait, He climbed the tall tree near by, The lion got up alive, It killed all the three, And had a nice lunch. Why the 4th one is saved? Is it the knowledge or the Common sense? Which one is greater?