One of the rare oddities of astrology is the occurrence of finding an unaspected planet in a chart. Our first inclination is to not know what to do with this, which is why for many years astrologers have interpreted this as a "dumb note on a chart."
Yet, everything occurs for a reason, and the occurrence of birth at a time when one of the planets was not in aspect to any other has a reason too. Throughout the individual's life, this planet looms just beyond their reach, suggesting that this must be dealt with it in a different way than their other planets.
To understand this, we have to realize that each planet stands for something,- a particular energy needed for the individual's life, and it is the proper balance and integration of all the planets in an individual's chart that helps them to lead a normal and productive life. If a planet cannot be integrated with the rest of the horoscope, then the individual feels a lack of everything the planet's energies symbolize.
For example, an unaspected Venus could suggest that the individual seems to have no say or control over the direction their love life takes. An unaspected Saturn could make it difficult for a person to take charge of organizing their plans for life in practical ways. Whatever the planet is, the individual tends to lack having any say in the outcome of events in that area of life.
Now we have to ask ourselves, what purpose is there in this? We ask this, because if we know the universe at all, we understand that everything has a purpose and meaning, even if some things seem obscure.
From a Karmic point of view, we could infer that the unaspected planet is something the individual has not yet earned mastery enough with that they can trust their own decisions in this area of life. We might even ask if the individual is being denied the use of a planet as some kind of karmic retribution or punishment?
