Quote #9 & 10

“It is the cause, it is the cause, my soul. Let me not name it to you, you chaste 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” (5.2.1-5).

"Are there no stones in heaven but what serves for the thunder?— Precious villain!" (5.2.281-282)

Othello has a sort of combination of passion and reason at this time. He is killing Desdemona out of his own passion, but he thinks it is reasonable considering what she did. Othello believes he has good reasons for this murder.

Right at this moment Othello runs at Iago right after he realizes the unfaithfulness of Desdemona was a trick and not the truth. He is acting out of passion (anger) because he has now killed his wife for what he thought was a good reason and turns out not to be.