My lord, will you be true?

Cressida
My lord, will you be true?
Troilus
Who, I? Alas, it is my vice, my fault.
Whiles others fish with craft for great opinion,
I with great truth catch mere simplicity.
Whilst some with cunning gild their copper crowns,
With truth and plainness I do wear mine bare.
Fear not my truth. The moral of my wit
Is “plain and true”; there's all the reach of it.