You mustn't underestimate an audience's intelligence.
One mustn't ask apple trees for oranges France for sun women for love life for happiness.
The government's desire to expand global trade may be understandable but we mustn't give away too much. We must tell our elected representatives to at least delay the Canada-China FIPA until it has been examined more thoroughly and to reconsider the inclusion of investor-state arbitration mechanisms in all trade deals.
Stupidity is also a gift of God but one mustn't misuse it.
You mustn't take what I say as gospel because no one can second-guess the future.
Being a funny person does an awful lot of things to you. You feel that you mustn't get serious with people. They don't expect it from you and they don't want to see it. You're not entitled to be serious you're a clown.
So we mustn't lower our guard in any sense because of what has happened in terms of the death of Osama Bin Laden and we are certainly not doing that. The terror threat level here in the U.K. remains at severe and we're very conscious of the need to continue that.
My dad said 'The thing that I was told that was really helpful was that I mustn't be afraid of the things I was afraid of when I was five years old'. The shock of his childhood had put him in this defensive crouch against the world and he needed to know that he had a nice wife and kids and it wasn't the same any more.
Arguments are extremely vulgar for everyone in good society holds exactly the same opinion.