Please let me know the meaning of underlined sentence.

Scientific ideas are often counterintuitive to everyday thinking. For example, when you place your hand on a piece of metal in a room, it feels cool to your touch. When you place your hand on a piece of wood in the same room it feels warmer to the touch. Many people will deduce that the temperature of the metal is cooler than that of the wood. Yet, if the objects have been in the same room for any length of time, their temperatures will be equal. It turns out that when you place your hand on metal, it conducts heat out of your hand quickly, thus giving the impression that it is cold. The wood does not conduct heat as rapidly as the metal and therefore “feels” warmer than the metal. In other words, our senses have fooled us intothinking that instead of everything in the room being at room temperature, the metal is cooler than anything else. Therefore our erroneous conclusion: Metal objects are always cooler than other objects in a room. Indeed, if you go from room to room and touch many objects, your idea is reinforced and becomes more and more resistant to change.

Hi everyone.

The above text is from the book I study. I understand what the author wants to say but have no idea at all about the underlined sentence.

Can you please explain the implication of the sentence?

Thanks in advance.