In the higher degree that the thought is logical, sensible, healthy, objective, unsentimental, impersonally, the more effective and capable it is.
Here the Enlightenment Philosophers were right in their view of the reason.
In the sense the thought is necessary, in that sense you must use the thought in order to be able to function in life.
And still the mind must have the ability to be completely free from all kinds of distortions, so that it can find out what is true.
There must be harmony between the living function in the thought and freedom from the thought.