I mentioned in few previous threads I published an hour ago have my Part of Spirit in Aries and my personality has been transitioning into that of an Aries. According to stuff I found online, the Arabic Parts are useless if they don't conjunct a planet. I initially thought it was because my Part of Spirit is in Aries my personality has become more and more Aries lately because its so close to my Mercury in Aries. But its a dammnnn near miss (just a few a degree or two more for my Mercury in Aries and it would have conjunct my Part of Spirit!!!!).
But I just looked at my Parts right now and learned my Part of Hope in Aries actually conjuncts my Mercury! What would this signify?
I am really wondering if there is a reason according to astrological theory why my personality is really becoming that of an Aries.
The 'Arabic Parts' developed the system of 'Lots' used by the Hellenistic Astrologers, since the dawn of Horoscopic Astrology. 'Developed' here means added to. Al-Biruni (1029) lists some 97 'Parts' of which the Part of Hope is one. As far as I'm aware, this Part was not included in the Hellenistic Lots and is an arab addition. Al-Biruni defined it as:
Asc + Mars - Moon (for a diurnal chart, reversed for a nocturnal one).
Al-Biruni used this Part in connection with Eleventh House issues - the eleventh being the House associated with hopes and aspirations. And it would be used to amplify issues relating to the eleventh in a reading (natal or horary).
On the point about Parts being useless unless in conjunction with a planet, this is purely a modern notion. The Hellenistic and Arab Astrologers would use one of the rulers of the Lot as it's significator - the Sign ruler, exaltation ruler, triplicity ruler, bound ruler or decan ruler - usually the arabic Astrolgoers would use either the sign or Bound ruler. That planet and it's condition would tell you what you need to know about the subject of the lot. So if your Part of Hope lies in Aries, you would examine Mars in terms of it's strength both essentially and by placement. Aspects to the ruler would be considered, whether from fortunes such as Venus and Jupiter or from infortunes, such as Saturn and Mars (in this case you would simply take the condition of Mars, as above).
If there was a planet conjunct the Lot/Part that might also influence the reading if it was a fortune or infortune.
On your comment about personality and the Lot of Spirit, that is very much a modern conception of Lynn's and I don't think it's widely held. Ronia's description is the historically more accurate one. It's reasonably clear that the arabic Astrologers did not believe in past lives, as a general statement (they were Muslims) and whilst there's evidence for some ideas of reincarnation in Greek philosophy (Plato's Timaeus for example) they did not have a concept of Karma in the sense of one life affecting the challenges of subsequent lives. They did have a strong concept of Fate, but within a person's lifetime. So is it because of a past life or because of what the Fates have decreed for your present life that a particular issues arises? I don't know how to answer that in any definitive sense. Interestingly Jyotish (Vedic Astrology) doesn't use Lots/Parts but it does focus very much on Karma.
There are several issues with Lots/Parts of which the main ones arre:
The Lot may have the same title over several authors but they might calculate it differently
The same calculation might have different names, either between authors or even with the same author - (Al-Biruni uses the same calculation for a Lot of Marriage for nocturnal births). This is because the planets don't just have one natural signification but are multi dimensional.
The Parts/Lots can incorporate the outer planets, new planets, or other objects, or house cusps or even other Parts/Lots - there's almost an industry in inventing new ones. That's one of the reasons why they fell out of use - they became discredited by over use and burgeoning numbers.
That being said, I do use the Lots quite a bit, though I keep to the Hellenistic ones and even then to a select few - the original Hermetic Lots plus ones relating to marriage and family.