It is for me, but as I noted, we probably mean different things when using that word. You seem to include things that you don't know are correct. I don't. Of course, maybe you have a different definition for knowing than I do. Mine is closely allied with words like truth and fact, and all of it is tied to empiricism. Likewise with words like existence and reality, which are also anchored in the evidence of the senses. Lose that connection and one's thoughts about these matters become useless.
The following is from an anonymous Internet persona who calls himself AnticitizenX, and summarizes the empiricist position nicely:
"How many angels can dance on the head of a pin. No matter what answer you give, literally nothing changes. No decision you will ever make in your entire lifetime can ever be influenced by the answer to this question. If nothing changes even in principle with respect to some proposition being true or false, then the distinction between them just vanishes.
"Truth has no meaning divorced from any eventual decision making process. The whole point of belief itself is to inform decisions and drive actions. Actions then influence events in the external world, and those effects lead to objective consequences. Take away any of these elements and truth immediately loses all relevance.
"We should expect similar decisions made under similar circumstances to lead to similar outcomes. Pragmatism says that the ultimate measure of a true or false proposition lies in its capacity to produce expected results. If an idea is true, it can be used in the real world to generate predictable consequences, and different ones if that idea turned out to be false. In other words, the ultimate measure of a true proposition is the capacity to inform decisions under the expectation of desirable consequences.
"All we need to know is that we have desires and preferences, we make decisions, and we experience sensory perceptions of outcomes. If a man has belief B that some action A will produce desired result D, if B is true, then doing A will achieve D. If A fails to achieve D, then B is false. Either you agree that truth should be measured by its capacity to inform decisions and produce results or you don't. If you agree, then we can have a conversation. And if we disagree about some belief, we have a means to decide the issue.
"If this is not how your epistemology works - how you define truth - then we can't have a discussion, and I literally don't care what you think, since it has no effect on anything."
It did for me. I used no other method but empiricism to discover what was meaningful to me and how best to configure my world to live a satisfying life. Many understand that to mean that I recommend reason as the only mode of thought. I don't. Here's a post to another poster in response to his comment that we are all irrational at times that explains my position more fully:
"Agreed, and that is a good thing - except when we're trying to decide what's true about the world. Then, only rational, empirical thinking is desirable. But at other times, modes of thought based in intuitions such as moral intuitions or what is beautiful are preferable, neither depending on reason or empiricism.
I find the example of improvising on a musical instrument like an electric guitar instructive. The first part is rational - learning how the instrument is tuned, where the chords and scales are on the neck, learning music theory, etc.. One is in a focused mode then. But later, when the skills have been learned, and one is playing music, the mental state is very different, attention is not concentrated but diffuse, and one is thinking about what is beautiful, not what is true. The latter is an irrational mode of thought, but since the word is insulting for many, maybe better called nonrational thought.
But that's where the money is in life - the passions, not the reasoning. Reasoning is just a means for arranging the passions, for facilitating more of the enjoyable experiences and fewer of the dysphoric ones. I like the metaphors of the horse and rider or the brush and the pigment to represent this relation of affective experience being managed by cognitive thought. They're both necessary for a good life. Either alone is disastrous. Passionless reason is dull, and in the extreme, the anhedonism of major depression - the inability to experience pleasure - leads to suicide or suicidal ideation. And passion without reason is eventually self-destructive.
So reason deserves to be exalted, but only as a means to an end. Absent the passions, it has little value except to prolong a colorless life."
That is what I have learned about life, I learned it empirically (trial and error), and that understanding has served me well. I offer it to you for your consideration and to take from it whatever you can.