We do not quite say that the new is more valuable because it fits in; but its fitting in is a test of its value - a test, it is true, which can only be slowly and cautiously applied, for we are none of us infallible judges of conformity.
The true test of courage is to be afraid and to go ahead and do it anyway - to be scared, is to have your knees knocking, but to walk on in there anyway.
When I test I never go right to the limit. Only because when you are below the limit you can go at the same speed all day, and that's the only way you can be absolutely sure about what you are testing.