All conscious activity exists as energetic frequencies on certain levels like radio stations/channels....Have you ever considered frequency as the denominator or correlation for spiritual communication/experience? perhaps consider conscious awareness as a level or vibration of frequency like a radio wave that has specific wavelengths that if you wish to tune in, you must establish that frequency/channel or signal before tuning in, in other words being a transmitter/receiver of types.
"Receiver" (you) being the mechanistic conductor/device of what is being transmitted, in this sense, in order that we receive spiritual frequencies (knowledge) or experiences one must have the correct channel and device to receive information on that level of frequency. Consider your being as a transmitter or conductor, where whatever channel or frequency you are tuned into or operating from is what you will experience or receive. Being only a receiver for one channel or frequency would dictate what you receive and what you could be aware of.
Same thing with spirituality really, we will receive from whatever "channel" we tune into to, or whatever channel or frequency we are consumed with observing. Just a different way of proposing why there are people who experience this and those who do not and what the differences are. If you want to experience or tune into a frequency you have never tuned into, try adjusting the channel or frequency. This is kinda how spirituality works, it challenges the individual to tune into another "channel" or frequency.
"In radio communication systems, information is carried across space using radio waves. At the sending end, the information to be sent, in the form of a time-varying electrical signal, is applied to a radio transmitter."
"The radio waves from many transmitters pass through the air simultaneously without interfering with each other. They can be separated in the receiver because each transmitter's radio waves oscillate at a different rate, in other words each transmitter has a different frequency. "
"It has a natural resonant frequency at which it oscillates. The resonant frequency is set equal to the frequency of the desired radio station. The oscillating radio signal from the desired station causes the tuned circuit to oscillate in sympathy, and it passes the signal on to the rest of the receiver. Radio signals at other frequencies are blocked by the tuned circuit and not passed on."
Perhaps your channel or station is set to only a certain "radio wave"?