Do not doubt that, before Emilia here I give thee warent of thy place Asoure thee, if I do vow a friendship, Ill preform it to the last airtime. my lord shall never rest. Ill watch him tame and talk him out of patience. His bed shall seem a school, his board a shrift, Ill intermingle everything he does with Cassio's salt. Therefore be merry Cassio for thy solicitor shall rather die than give they cause away.
I think tho dost. And for I know thou't full of love and honesty and weights' thy words before thou give's them breath, therefore these doted of thine fright me the more. For such things in a false disloyal knave are tricks of custom, but in a man that's just they are close dilations, working from the heart, that passion cannot rule
Good name in man and woman, dear my lord, is the immediate jewel of their souls. Who steals my purse steals trash. Tis something, nothing twas mine, tis his, and has been slave to thousands. But he that filches from me my good name Robs me of that which not enriches him and makes me poor indeed
I'll know thy thoughts
Desdemona is telling Cassio and Emilia that she will do whatever it takes to get Cassio his job back. She will talk to Othello nonstop until he gives in.
Othello is telling Iago that he believes he is one of the most honest people he knows and he believes that if he is suspicious about something then it must be true.
Iago is telling Othello that he doesn't want to destroy someones good reputation because reputation is one of the most valuable things that we have.