Why don't we know everything yet?

Neil DeGrasse Tyson said:

"As I galaxy-gaze through time upon their diversity of colors, shapes, sizes, brightnesses, and structural detail, the boundary between knowledge and ignorance calls to me. When I reach for the edge of the universe, I do it knowing that along some paths of cosmic discovery, there are times when, at least for now, one must be content to love the questions themselves"

In attempting to answer life's questions, we inevitably reach a point where we can't find answers, and all that we have is speculation. The more we learn, the more we hypothesise; the more we test and prove those hypotheses, the more questions we answer, and the more new questions present themselves. With each iteration we have greater knowledge on which to base our speculation, but always there remain things we don't know. 

Through accepting this, and through constantly learning, and correcting earlier assumptions, I have concluded that there are three things which must be the foundation for my journey along the mortal coil:

1. Everything I believe might be wrong.

2. I believe what I believe based on evidence, and will change those beliefs if presented with evidence which compels me to.

3. Anything can be explained by science. Anything for which humans don't have an explanation, it is because humans don't yet have sufficient understanding of the science involved.

It's not uncommon to assume that anything which we can't prove scientifically cannot be proven. In fact, based on what we know thus far, it's likely that anything which truly exists can be proven by applying the scientific method - we simply don't yet have sufficient understanding to apply it. 

Everything we know - the full extent of human knowledge, has taken thousands of years to accumulate. It's also all based on data we have either acquired on or very near to earth, or which is millions of years old. There's so much of the universe that we haven't even seen yet. And what we have seen probably looks vastly different now, as the light it gives off takes so long to reach us. Many of the answers may depend on concepts that don't even exist in our corner of the universe, or that we simply aren't yet able to comprehend. 

Carl Sagan said:

"The sky calls to us. If we do not destroy ourselves, we will one day venture to the stars"

We've evolved all the way from amino acids in primordial soup to thinking, feeling, space-faring, sentients, but we still have a long way to go. The answers are all out there. By the time we run out of questions we may have evolved so far as to be unrecognisable as the descendants of these "ugly bags of mostly water".

It's the questions that will lead us there. It's the questions that will continue driving us to improve, to explore, to discover. We don't know everything yet. Maybe we never will. But we can learn to love the questions. And maybe we can be content with knowing enough to not destroy ourselves.