New ideas change the way people live because they think of new ideas and make changes in there life
Unity is important for an effective functioning of a country and for prevention of conflicts: if there was no unity, people could not finish bigger projects that require cooperation with others.
Diversity is important for innovation and creativity: if we were all the same, little would change and sometimes change is for better.
Answer:
the Dalai Lama spiritual leader
Lexington and Concord, Massachusetts on 19 April 1775