1) Act I, Scene 1:

Iago informs Brabantio that Othello and Desdemona have eloped

"I am one, sir, who comes to tell you your daughter

and the Moor are making the beast with

two backs." (Lines 128-131)

2) Act I, Scene 2:

Othello does not hide but his life on his reputation in regards to his marriage to Desdemona

Not I.  I must be found.

My parts, my title, and my perfect soul

Shall manifest me rightly.  (lines 35-37)

3) Act I, Scene 3:

Desdemona defends Othello

And so much duty that my mother showed

To you, preferring you before her father,

So much I challenge that I may profess

Due to the Moor my lord.  (lines 213-218)

4) Iago plots to ruin Othello

He hath a person and a smooth dispose

To be suspected, framed to make women false. 

The Moor is of a free and open nature

That thinks men honest but that seem to be so,

And will as tenderly be led by th' nose

As asses are.  (lines 440-445)

5) Othello praises his good fortune to be happy with his wife

If it were now to die,

'Twere now to be most happy, for I fear

My soul hath her content so absolute

That not another comfort like to this

Succeeds in unknown fate. (lines 205-209)

6) Act III, Scene 3:

Iago plays on Othello's fears

O beware, my lord, of Jealousy!

It is the green-eyed monster which doth mock

The meat it feeds on.  That cuckold lives in bliss

Who, certain of his fate, loves not his wronger;

But O, what damned minutes tells he o'er

Who dotes, yet doubts; suspects, yet strongly loves! (lines 195-200)

7) Act IV, Scene 1:

Othello accuses Desdemona of lying

O, devil, devil!

If that the Earth could teem with woman's tears,

Each drop she falls would prove a crocodile. 

Out of my sight! (lines 273-276)

8) Act V, Scene 2:

Othello convinces himself to kill Desdemona despite his love for her

It is the cause, it is the cause, my soul. 

Let me not name it to you, the stars. 

It is the cause.  Yet I'll not shed her blood,

Nor scar that whiter skin of hers than snow,

And smooth as monumental alabaster.

Yet she must die, else she'll betray more men.

Put out the light, and then put out the light. (Lines 1-7)

9) Othello, after unsuccessfully attempting to kill Iago:

I am not sorry neither.  I'd have thee live,

For in my sense 'tis happiness to die.  (lines 340-341)

10) Othello kills himself:

I kissed thee ere I killed thee.  No way but this,

Killing myself, to die upon a kiss.  (lines 420-421)