“The cruelest prison of all is the prison of the mind.”
“Men are not prisoners of fate, but only prisoners of their own minds.”
“A mind of one logic is the mind of a prison.”
“A mind enclosed in language is in prison.”
“Every man is a prisoner, and the greatest irony of all is to be the prisoner of another man.”
“They have chosen cunning instead of belief. Their prison is only in their minds, yet they are in that prison; and so afraid of being taken in that they cannot be taken out.”