The myths have always condemned those who 'looked back.' Condemned them, whatever the paradise may have been which they were leaving. Hence this shadow over each departure from your decision.

The longest journey
Is the journey inwards.
Of him who has chosen his destiny,
Who has started upon his quest
For the source of his being.

Is life so wretched? Isn't it rather your hands which are too small, your vision which is muddled? You are the one who must grow up.

Do not seek death. Death will find you. But seek the road which makes death a fulfillment.

Destiny is something not be to desired and not to be avoided. A mystery not contrary to reason, for it implies that the world, and the course of human history, have meaning.

Humility is just as much the opposite of self-abasement as it is of self-exaltation.

Do not look back and do not dream about the future. It will neither give you back the past, nor satisfy your other daydreams. Your duty, your reward, your destiny, is in the present moment