Opposition is a natural part of life. Just as we develop our physical muscles through overcoming opposition - such as lifting weights - we develop our character muscles by overcoming challenges and adversity.
Stephen R. Covey, A. Roger Merrill, Rebecca R. Merrill (1997). “First Things First Every Day: Daily Reflections- Because Where You're Headed Is More Important Than How Fast You Get There”, p.115, Simon and Schuster
