Here is a quick thought.
There is something called parivrajak-yoga which is an astrological alignment defined as having four or more planets in a single sign. The effect of the yoga is classically defined as “renunciation” and sanyassa. The actual effect is that we lose interest in enjoying the world and prefer to / need to look for deeper relevance and meaning in life. Therefore we wind up giving away or abandoning what most people would want in search for that deeper thing that we truly want.
Why is it that 4 planets in a sign has this effect?
Some people think it’s because it makes you unstable and crazy, to have that many parts of life (planets) put in the same environment (sign).
Here is what I think:
There are sankhya-yogas and really this parivrajak-yoga is a derivation of those. Sankhya means “count.” The sankhya yogas count how many signs the planet occupy. Now you can see why I say parivrajak-yoga is a derivation of sankhya yogas: because it counts how many planets are in a sign.
There are only seven planets you can deal with (Rahu and Ketu don’t factor in to sankhya-yogas, and classical astrology doesn’t count the multitude of new planets and quasi-planets). So if you have four planets in one sign it means that at most you can only have your planets in a total of four signs (if the other three planets are each in separate signs). So if you have a yoga for renunciation (parivrajak-yoga) you cannot have a sankhya yoga higher than four houses. The higher count yogas produce people who enjoy life and are materially productive. The lower count yogas produce people who struggle to attain something more significant.
The fifth yoga is particularly important to this discussion. When the planets occupy five signs it is called harsha – the effect of which is that we see the world as something fit to enjoy. We are more delighted with life, and see everything as something enjoyable (this is putting it in a bright perspective, it also makes hedonists). If you have four planets in one sign you cannot have this harsha. That means you cannot get excited about exploiting people and objects for your personal enjoyment and pleasure.
If you have four planets in one house you must have either a four, three, two or one count yoga. And these are all yogas which make us dissatisfied with the external world and seek something better.
I think this is the logic behind parivrajak-yoga.