A theory about STS I keep running across

[zenmaster]

So zen, the rational mind protects the ego/our perception from suddenly being fully aware of infinity?

It's a function of space/time orientation which divides and constrains things to be suitable for evaluation. The ego is 'protected' by the personal mind in general (one's experience), regardless of faculties used.
Also to arbitrarily divide one's totality into 'heart' and 'head' is fallacious. It comes from the unconscious need to balance the perceived over reliance/shortcomings on/due to the 'head' (where head is rationality). So we unconsciously project that restoration of balance onto the transcendent paradigm imagined for 4D.

I'd love to hear your take on what it means to be more rational in 4D. Any examples?

Greater awareness means more info available for processing, including a different view of space/time and time/space, seeing consequences both immediately and possibilities more into future. Imagine an activity such as 'planning', with use of rational mind and the expanded awareness.

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As far as examples, most of mine come from "Fore's" biographical thread and chat discussions on another forum where he related his past experiences with the behavior of 4D entities.