"Obedience is the great test of life."

-Thomas S. Monson

What he is meaning by this quote is that Obedience tests how you are and will be in life. Obedience determines how you can handle things, how you treat others, it shows a lot about a person overall. 

“Obedience sums up our entire duty.”

- Hosea Ballou

Obedience is what makes us a better person and is a task we need to take and succeed on. Obedience shows so much about a person, respect, maturity, kindness, being thoughtful, etc.