Receptivity
Receptivity seems to be a gateway into so much else - gratitude, appreciation, humility, freshness, perception, seeing ideas for what they are, learning, maturing, awakenings, integration, seeing in oneself what one sees in others.
Without receptivity, there is resistance, stagnation, boredom, narrowness, attachment to ideas, seeing oneself as better or worse than others.
Receptivity allows us to shift into the nature of mind, and is really only possibly when we rest as/in the nature of mind - when we awaken to ourselves as space & awareness, as the Witness, and eventually as Big Mind. And it is what allows us to rehumanize it all.
It is the gateway into it, and the fruition of it.