“Remember, each one of us has the power to change the world.”

As quoted in "Independence Day: Bollywood stars wish peace, progress, prosperity" in The Times of India (15 August 2014) http://timesofindia.indiatimes.com/entertainment/hindi/bollywood/news/Independence-Day-Bollywood-stars-wish-peace-progress-prosperity/articleshow/40306133.cms.
Context: Change cannot come from one politician, it has to come from each one of us and not just for today... it's a gradual process. Let's be responsible & work towards it.

[O] : Introduction, 0.7
Semiotics and the Philosophy of Language (1984)
Context: A philosophy has a practical power: it contributes to the changing of the world. This practical power has nothing to do with the engineering power that in the discussion above I attributed to sciences, including specific semiotics. A science can study either an animal species or the logic of road signals, without necessarily determining their transformation. There is a certain 'distance' between the descriptive stage and the decision, let us say, to improve a species through genetic engineering or to improve a signaling system by reducing or increasing the number of its pertinent elements.
On the contrary, it was the philosophical position of the modern notion of thinking subject that led Western culture to think and to behave in terms of subjectivity. It was the position of notions such as class struggle and revolution that led people to behave in terms of class, and not only to make revolutions but also to decide, on the grounds of this philosophical concept, which social turmoils or riots of the past were or were not a revolution. Since a philosophy has this practical power, it cannot have a predictive power. It cannot predict what would happen if the world were as it described it. Its power is not the direct result of an act of engineering performed on the basis of a more or less neutral description of independent data.

Source: Inaugural Address (1989)

2011, Remarks at a Dedication Ceremony for the Martin Luther King, Jr., National Memorial (October 2011)

" Lighting your way to a better future : Speech delivered by Mr N R Mandela at launch of Mindset Network http://db.nelsonmandela.org/speeches/pub_view.asp?pg=item&ItemID=NMS909&txtstr=education%20is%20the%20most%20powerful," July 16, 2003 at db.nelsonmandela.org. ; Cited in: Nelson Mandela, ‎S. K. Hatang, ‎Sahm Venter (2012) Notes to the Future: Words of Wisdom. p. 101.
2000s
Context: Education is the most powerful weapon we can use to change the world and is a powerful part of that world changing arsenal.

Books, When Will Jesus Bring the Pork Chops? (2004)

Songs and Sonnets (1633), The Good-Morrow
Context: p>I wonder, by my troth, what thou and I
Did, till we loved? Were we not weaned till then?
But sucked on country pleasures, childishly?
Or snorted we in the Seven Sleepers’ den?
’Twas so; but this, all pleasures fancies be.
If ever any beauty I did see,
Which I desired, and got, ’twas but a dream of thee. And now good-morrow to our waking souls,
Which watch not one another out of fear;
For love, all love of other sights controls,
And makes one little room an everywhere.
Let sea-discoverers to new worlds have gone,
Let maps to other, worlds on worlds have shown,
Let us possess one world, each hath one, and is one.My face in thine eye, thine in mine appears,
And true plain hearts do in the faces rest;
Where can we find two better hemispheres,
Without sharp north, without declining west?
Whatever dies, was not mixed equally;
If our two loves be one, or, thou and I
Love so alike, that none do slacken, none can die.</p

“Interview with Milton Friedman”, Playboy magazine (Feb. 1973)