If your actions inspire others to dream more, learn more, do more and become more, you are a leader. (John Quincy Adams, 6th U.S. president)
We sometimes like to define our terms in rather restrictive ways, but simple observation is often very helpful, too. As Adams pointed out, you can identify a leader not only by the results of his stated objectives, but also by what has impacted his followers. It should encourage others, who may not see themselves as “formal” leaders, to influence them to do their very best, as well.
The words of the godly encourage many. (Proverbs 10:21)
Let us think of ways to motivate one another to acts of love and good works . . . [and] encourage one another. (Hebrews 10:24-25)