510. The journey to the final results is usually long and painful.

- Sujit Mukerji

509. He who flees at the right time can fight again.

- Marcus Trentius Varro

508. Better slip with foot than tongue.

- Ben Franklin

507. When you say one thing, the clever person understands three.

506. When strict with oneself, one rarely fails.

- Confucious

505. When there is no enemy within, the enemies outside cannot hurt you.

- Winston S Churchill

504. You can't make bricks without straw.

503. It is wise not to seek a secret and honest not to reveal it.

- Ben Franklin

502. Truth can pass through three stages:

1. It can be ridiculed;

2. It can be violently opposed;

3. And, finally, it can be/is accepted as being self-evident.

501. Just because everybody's doing something, doesn't mean it's right.