Emancipate yourself from mental slavery,
None but ourselves can free our minds.
Have no fear for atomic energy,
'Cause none of them can stop the time.

We are going to emancipate ourselves from mental slavery because whilst others might free the body, none but ourselves can free the mind. Mind is your only ruler, sovereign. The man who is not able to develop and use his mind is bound to be the slave of the other man who uses his mind.