In the act of ready-food consumption itself, for example, from an early stage in life, there is usually no separation between thinking and doing. We think of how the food is to be consumed and instantly act upon it. Even with food that needs some preparation, thinking 'how' is not yet separated from doing 'what'.
It is once the search for food becomes more complicated, like when an agricultural system has to be created and organized or when roads and vehicles for appropriating the food need to be created, that separation occurs. Time is set apart for thinking-theorizing about 'how' to bring about, only afterwards does it become possible to consume. At this point, thinking 'how', separates from doing 'what'.
Also in cases in which the doing has been inculcated by inheritance, education and imitation, but does not have the backing of thinking in direct perception, doing 'what' separates from thinking 'how'.
Unlike in the prior example of instant food consumption in which thinking and doing are naturally united, in the latter examples they are separated into different instances of consciousness. It is like thinking is done in an intellectual laboratory and acting (doing) is done in a processing factory. This is commonly related to as head vs. the heart resulting in hands.
Such divorce occurs because of the human limited encompassing capacity. For the same reason, the psyche naturally deteriorates into an opposing mind-heart battle that needs a resolving-healing process through countless generations. (The separation is illustrated by the story of Eden mentioned in another discussion and the healing process as PDR is mentioned in yet another discussion.)
Within many religions of the past and in present psychological schools of thought, there have been many attempts to resolve this mind-heart dichotomy, but not to any significant avail. Humans whether thinkers or doers, turned into kind of circus clowns. The former repeat inherited stories and the latter practice hollow ceremony rituals.
To unite the thinking with feeling-doing, an environment is needed, which enhances and enforces:
a) a prime view - meaning that all that is handled by thinking refers primarily to its vivid direct sentient perception and not to its representing language. As a consequence no denial of any existent occurs.