So may it be indeed.
Methinks thy voice is altered and thou speak’st
In better phrase and matter than thou didst.
– William Shakespeare
King Lear, Act 4, Scene 6. A suspicious Gloucester notices a change in the way Edgar is speaking as he grows tired of his madman disguise. Gloucester believes that his voice is changed and he is speaking more eloquently. Edgar has to hastily re-adopt his peasant accent and vocabulary after that. The blind Gloucester is planning to commit suicide by jumping off the Dover cliffs, so Edgar is making a pretence of taking him up there.