The question is how much.
How much they felt it necessary to make the talk successful.
If the wish is strong , then one thing is necessary. Without it, the talk will not be successful.
That is honest.
If both parties can be honest to each other, there will be success.
But honest is very difficult. It is not easy to be honest.
Unless the wish is so strong, stronger than anything, then they will be honest to each other.
9068 How can the China-America talk be successful? 201704