Most powerful is he who has himself in his own power. Seneca
The person who apologizes is the bravest. The person who forgives is the most powerful. The person who forgets offenses is the happiest. Source: Internet
Education is the most powerful weapon which you can use to change the world. Nelson Mandela
The most powerful weapon on earth is the human soul on fire. Ferdinand Foch
If we desire to avoid insult, we must be able to repel it; if we desire to secure peace, one of the most powerful instruments of our rising prosperity, it must be known, that we are at all times ready for War. George Washington
We are the most powerful nation on earth. No external power, no terrorist organization, can defeat us. But we can defeat ourselves by getting caught in a quagmire. George Soros