1.A bird in the hand is worth two in the bush.
Source: Pastorals--Spring (l. 23)

2. Fools rush in where angels fear to tread.

3. Of fight or fly, This choice is left ye, to resist or die.
Source: Homer's Odyssey (bk. XXII, l. 79)

4. Who builds a church to God, and not to Fame,

 Will never mark the marble with his Name.
Source: Moral Essays (ep. III, l. 285)

5. Be not the first by whom the new are tried,

 Nor yet the last to lay the old aside.

Source: Essay on Criticism (pt. II, l. 336)

6. Satan is wiser now than before,

And tempts by making rich instead of poor.

Source: Moral Essays (ep. III, l. 351)
 

7. Histories are more full of examples of the fidelity of dogs than of friends.
Source: Letters to and from H. Cromwell, Esq.--Letter X

8. 'Tis education forms the common mind.

Just as the twig is bent, the tree's inclin'd.

9. Envy will merit as its shade pursue,

But like a shadow, proves the substance true.
Source: Essay on Criticism (pt. II, l. 266)

10. Good-nature and good-sense must ever join;

To err is human, to forgive, divine.
Source: Essay on Criticism (l. 522)

11. One who is too wise an observer of the business of others, like one who is too curious in observing the labor of bees, will often be stung for his curiosity.
 

12. He who tells a lie is not sensible of how great a task he undertakes; for he must be forced to invent twenty more to maintain that one.

13. What the weak head with strongest bias rules,

Is pride, the never-failing vice of fools.
Source: Essay on Criticism (l. 203)

14. Envy will merit as its shade pursue,

But like a shadow, proves the substance true.
Source: Essay on Criticism (pt. II, l. 266)

15. Hope springs eternal in the human breast,

Man never is, but always to be blest.
Source: Essay on Man (ep. I, l. 95)

16.Damn with faint praise, assent with civil leer,

And without sneering teach the rest to sneer;

Willing to wound, and yet afraid to strike,

Just hint a fault, and hesitate dislike;

Alike reserv'd to blame, or to commend,

A tim'rous foe, and a suspicious friend.
Source: Prologue to Satires (l. 201)

17. He that fights and runs away,

Will live to fight another day;

For he that runs may fight again,

Which he can never do that's slain.

Source: Prologue to Satires (l. 84)

18. Always do right. That will gratify some of the people and astonish the rest.
Source: Essay on Man (ep. I, l. 289)

19. Trust not yourself, but your defects to know,

Make use of every friend and every foe.

20. 'Tis with our judgments as our watches, none Go just alike, yet each believes his own.
Source: Essay on Criticism (l. 9)