Inspirational messages from Antiquity

The Ninja Master's Admonition

1. Know the wisdom of being patient during times of inactivity.

2. Choose the course of justice as the path for your life.

3. Do not allow your heart to be controlled by the demands of desire, pleasure, or dependence.

4. Sorrow, pain, and resentment are natural qualities to be encountered in life. Therefore, work to cultivate the enlightenment of the immovable spirit.

5. Hold in your heart the importance of family loyalty and pursue the literary and warrior arts with balanced determination.

I like this one because it really makes you think.

 The two-inch by one-inch sliver of paper it's written on is turning brown and crumbling, (nothing lasts forever), but I would like to keep the words alive as long as possible:

The comfort of mere religion will not suffice in the grander quest. Creeds, dogma, and doctrines actually work to interfere with the pure and unclouded perception of the universal laws in action.
True spiritual power must come from direct firsthand experience. Anything less is to worship the thought of someone else's experiences.
Just as the adulation of a rich man or praise of a family man cannot bring one wealth or children, the adoration of past saints cannot bring saintly power to one's own life.

I'd like to know if anybody can locate its origins 

From Dune by Frank Herbert (1965)

Confine yourself to observing and you miss the point of your own existence. The object can be stated as follows:

Live the best life you can. Life is a game whose rules you learn if you jump in and play it to the hilt. Otherwise, you are caught off balance, continually surprised by the shifting play. Non-players often whine and complain that luck always passes them by. They fail to understand that we make our own luck.

An idea for a future story:

It is written, that if you gaze into the mythical 'Mirror of the Soul' you will see yourself as others see you.

A special person, maybe one in a thousand, might look into that place and see themselves as they really are. Their faults, failings and redeeming features, equally on display; I wonder if I could handle that?

One in ten thousand can see in that mirror all the above and more. They can see others as they really are.

There is an antique/junk shop somewhere in the Lanes at Brighton, where a wizen old dowager presides over her unique collection of curios. If she likes the look of you she may be persuaded to part with some of her treasures. She stands behind an ancient analogue till that dwarfs her tiny frame. If you're observant you might see she glances behind her at a small unremarkable hand mirror, just before pronouncing that the item you're holding is not for sale at any price.