Peter F. Drucker said this quote

The knowledge that we consider knowledge proves itself in action. What we now mean by knowledge is information in action, information focused on results.

~ Peter F. Drucker

Management is doing things right, leadership is doing the right things.

~ Peter F. Drucker

Rank does not confer privilege or give power. It imposes responsibility.

~ Peter F. Drucker

People in any organization are always attached to the obsolete - the things that should have worked but did not, the things that once were productive and no longer are.

~ Peter F. Drucker