Jumping to insults, rather than asking for clarification on aspects that you are unsure of, doesn't accomplish anything.

Regardless, in another phrasing, people's ideas are shaped by their environment and current set of knowledge. When people act on their environment, their environment changes, informing them of new things and ideas, which in turn influences how they choose to act. This is repeated over and over, when people put their ideas to the test, parts of their ideas are confirmed, and others are rejected, allowing new hypothesis to be tested and confirmed or denied.

This is all obvious, of course, but Dialectical Materialism asserts that the primary driver of this process, ie which comes first, is the environmental aspect. People exist in their environment first, and then form their ideas based on that.

Of course, Dialectical Materialism has much, much more to it than that, such as looking at material reality in the context of motion, ie the river you see today is different from what it was yesterday because sediment has been eroded.