Acquisition of knowledge by humanity is dependent on the consciousness of the individual. When a person makes an observation and comes to an understanding, this understanding is this person's subjective knowledge. If another person, on making a similar observation, arrives at a similar subjective understanding, this knowledge they share can be taken to be part of humanity's objective knowledge. Thus, all of humanity's objective knowledge is a subset of all of humanity's subjective knowledge; that is, there can be no objective knowledge that has not been some person's (dead or alive) subjective knowledge. Thus, an intrinsic assumption behind all of humanity's objective knowledge is the similarity of the axioms of consciousness of the individuals.