Meaning:

You use this proverb to say that you can solve problems or achieve your purpose better and more effectively through communication with words than by violence with weapons. Edward George Bulwer Lytton (1803-1873), an English novelist, wrote this for the first time in 1839. He wrote, "Beneath the rule of men entirely great, the pen is mightier than the sword."
Here's another quote:

THE PEN IS MIGHTIER THAN THE SWORD? Here, we are offered the insight that words are superior to action, even deady killers, like swords. Meet Martin Luther's printed words that changed history, and all the king's men were useless. (James Crystal, 12/11/02)

This proverb means words are more powerful and effective than weapons in accomplishing your purpose.

Example:

I want to stress that articles you write on newspapers can change the world. The pen is mighter than the sword!

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