Now taste the pie-crust.

It is probably delicious.

Now taste the piece of the pie that has not been baked at all.
It is nauseous.

The difference is--one is butter and flour that has been cooked, the other is butter and flour that has not been cooked.
* * * * * One word of warning in conclusion.

Cooks should always remember the good old saying--that it is quite possible to have too much of a good thing.
They should be particularly warned to bear this in mind in adding herbs, such as ordinary mixed flavouring herbs, or, as they are sometimes called, savoury herbs, and thyme.