@Seed,
Seed wrote:How can one search for something if there was not doubt?
Easy. I do it all the time. For example, I'm messy, so in my daily life I have to search for my keys a lot. I have
never doubted the existence of my keys, no matter how little evidence of them I saw at the moment.
Moving on from such trivial searches to more "noble" ones for knowledge and the like, doubt still doesn't figure into them for me. For example, my motivation for checking out physical phenomena, and eventually becoming a physicist, were real-world observations I couldn't explain. One day I might ride my bike; as I got faster, the frame would start to vibrate, and vibrate more and more with increasing speed.
That was noteworthy in itself, but then something even more interesting happened: As I accelerated further, the oscillations would reach a peak and then get weaker again. When I rode as fast as my legs could pedal, there were barely any vibrations at all. Why would my bike behave like that? Fascinated by this question, I decided to search for the answer. That's how I first learned about the physics of oscillation and resonance.
Almost all important searches in my life follow this pattern. Doubt rarely plays a role in them.