God grant me the serenity
To accept the things I cannot change;
the courage to change the things I can;
and the wisdom to know the difference.
- Reinhold Niebuhr (Serenity Prayer)

There's a difference between knowing the path and walking the path.
- the character Morpheus in the movie The Matrix

There is a great difference between knowing and understanding:
you can know a lot about something and not really understand it.
- Charles Kettering

Know the power of perspective.
Be a passionate observer of life.
See the events, feel the emotions,
and recognize the difference.
- Jonathan Lockwood Huie

Further reading:  More About the Serenity Prayer

Great Truths

Consciously Choosing Your Truth

Different and Yet the Same