I'm actually a fan of the quotes on Ventari's Tablet in the game Guild Wars 2. (Kudos to whoever did the writing on this, A+ job.)
I. Live life well and fully, and waste nothing.
II. Do not fear difficulty. Hard ground makes stronger roots.
III. The only lasting peace is the peace within your own soul.
IV. All things have a right to grow. The blossom is brother to the weed.
V. Never leave a wrong to ripen into evil or sorrow.
VI. Act with wisdom, but act.
VII. From the smallest blade of grass to the largest mountain, where life goes—so, too, should you.
The second one is particularly good when the going gets tough. I also have a few nautical-themed proverbs, like "a ship in harbor is safe, but that's not what ships are for" and "smooth seas don't make skilled sailors". Don't know where I picked those up.
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