"He who speaks without modesty will find it difficult to make his words good" what is the meaning

Base your answer on the statements below and on your knowledge of social studies. speaker a: the political union created by the constitution of the united states is not a temporary compact of the states but rather an unbreakable bond created by the people of the nation. speaker b: the reserved powers are clearly indicated and protected in both the original constitution and in the 10th amendment of the bill of rights. speaker c: liberty is best preserved in the hands of the government closest to the people. union is desirable only if it preserves our liberty. speaker d: nullification! secession! what miserable words—words that threaten the continuance of both our liberty and our union which two speakers express the greatest support for the concept of state's rights?