The sole power of humans is- 'words' (includes all expressions), human can only think and speak or express, a person tries to express and achieve results but there are no guarantees of consequences. It is the world's nature that here only can think and speak, there is no guarantee of anything. The 'words' is the ultimate tools for all, and then try but no guarantee of any results. Even God sent the prophets only to deliver 'words', their only job...