Actually, it’s a little of both. I’m using “Socratic Irony” as a means to explore your beliefs, which I mostly (but not entirely) understand.
I’d have to counter that knowledge is gained when theories are proven, regardless of the existence of skepticism. As an example, a person trapped alone on an island could gradually gain knowledge through experimentation of how to build shelter and gather food. There is no skeptic present, thus skepticism is not necessary to gain knowledge.
Well, his sketches were interesting (a worthy result in and of itself) but they were in fact meaningless to the concept of human flight until experimental models could be built. Da Vinci did conduct some experiments in aerodynamics, which suggested his ideas had merit, though the necessary materials to build a proto-helicopter unfortunately didn’t exist. The concept of flight, or even human flight, did not originate with Da Vinci, though.
I should also point out that Da Vinci’s blueprints would have made grossly inefficient flying machines. Without the means to conduct full-blown experiments, he had no way of refining his ideas.
Actually, I have more than just stubborn skepticism to support the notion that spiritual truth is stagnant. You’ve quoted passages from the Book of Matthew, and I’ll assume you believe the New International edition is a reasonably accurate translation of what was actually said some 2000 years ago. Doesn’t this suggest that the ideas in the Bible are to be viewed as fixed and final, with no refinement necessary? This is contrary to the notion of progress.
Science, by defininion, is a process that recognizes no final authorities. The works of Darwin and Newton have been subject to refinement, as will be the works of Gould and Einstein. There was a time when the Catholic Church tried to make Aristotle the final scientific authority, with the result that when a scientist found a flaw and was able to demonstrate it using instruments, that scientist was persecuted and put under house arrest for the later years of his life.
I’d argue that spritual beliefs are, if anything, highly regressive, in that myths and misconceptions gradually sneak into the belief system, suplementing and sometimes replacing the original concepts. For example, was the fruit of the tree of knowledge really an apple? It’s not described as such in the Book of Genesis. Further, many of the beliefs currently held by many Christians regarding Hell actually spring from the wrtings of Milton and Dante, rather than the Bible.
I could, if I wanted to invest the time. More easily, I can enjoy the results of the experiments, i.e. I don’t need to re-prove Einstein’s Nobel Prize-winning work on the photoelectric effect in order to watch television, though television would not exist without that effect.
Because the alternative (a huge and watertight conspiracy among scientists to promote falshehoods) is highly improbable.