The whole course of human history may depend on a change of heart in a single, solitary, even humble individual. For it is within the soul of the individual that the battle between good and evil is waged and ultimately won or lost.

No matter how exotic human civilization becomes, no matter the developments of life and society nor the complexity of the machine/human interface, there always come interludes of lonely power when the course of humankind, the very future of humankind, depends upon the relatively simple actions of single individuals.

In the last analysis, the essential thing is the life of individual. This alone makes history, here alone do the great transformations take place, and the whole future, the whole history of the world, ultimately springs as a gigantic summation from these hidden source in individuals.

When it comes to the human soul, the real battle is the struggle to truly become oneself. Not the self that others might want us to be, not even the self that we might wish to be; but the deep self and inner soul trying to awaken at critical crossroads in each life.

The battle line between good and evil runs through the heart of every man.

To appreciate the importance of fitting every human soul for independent action, think for a moment of the immeasurable solitude of self. We come into the world alone, unlike all who have gone before us; we leave it alone under circumstances peculiar to ourselves. No mortal ever has been, no mortal ever will be like the soul just launched on the sea of life. There can never again be just such environments as make up the infancy, youth and manhood of this one. Nature never repeats herself, and the possibilities of one human soul will never be found in another. No one has ever found two blades of ribbon grass alike, and no one will ever find two human beings alike. Seeing, then, what must be the infinite diversity in human character, we can in a measure appreciate the loss to a nation when any large class of the people is uneducated and unrepresented in the government.

The balance between good and evil, and the choices we make between them, are probably the single most important aspects shaping our personalities and humanity.

In almost everyone's life there is one event that changes the whole course of his existence.

Everyone carries a part of society on his shoulders; no one is relieved of his share of responsibility by others. And no one can find a safe way out for himself if society is sweeping toward destruction. Therefore, everyone, in his own interests, must thrust himself vigorously into the intellectual battle. None can stand aside with unconcern; the interest of everyone hangs on the result. Whether he chooses or not, every man is drawn into the great historical struggle, the decisive battle into which our epoch has plunged us.

The development of good character is a battle that you, I, and everyone must fight for himself. But victory can be ours.

It’s the conflict between Apollo and Dionysus — a famous dilemma in mythology. It’s the age-old battle between mind and heart, which seldom want the same thing.

It's the age-old battle between mind and heart, which seldom want the same thing.

The subtle and deadly change of heart that might occur in you would be involved with the realization that a civilization is not destroyed by wicked people; it is not necessary that people be wicked but only that they be spineless.

If only there were evil people somewhere insidiously committing evil deeds, and it were necessary only to separate them from the rest of us and destroy them. But the line dividing good and evil cuts through the heart of every human being. And who is willing to destroy a piece of his own heart?

During the life of any heart this line keeps changing place; sometimes it is squeezed one way by exuberant evil and sometimes it shifts to allow enough space for good to flourish. One and the same human being is, at various ages, under various circumstances, a totally different human being. At times he is close to being a devil, at times to sainthood. But his name doesn't change, and to that name we ascribe the whole lot, good and evil.

Socrates taught us: 'Know thyself!