The sun is our inner light and how we shine as individuals. Saturn brings structure but does so by creating boundaries and limitations. Having the sun aspected by Saturn is kind of like dimming your own light, like a cloud in front of the sun. These people are quite reserved and never want to act over the top or be in the center of attention. Their limited self-expression can make them feel small, shy , silenced, insecure, ignored, unimportant.
These individuals do not want to break rules or draw negative attention. They are so scared of criticism, of not being good enough, that they hold back from letting their unique personality out. If you want to avoid criticism, you will also avoid praise. You won't risk the latter in fear of the former. So you do not express, do not show your talents, you aren't proud of anything you've done or created, fearing the embarrassment of them not being received well. You sell yourself short and feel uncomfortable when people have high expectations of you.
"The person wants their picture on the board but doesn't want to be seen to be wanting it, because on some level they believe that the picture isn't good enough or that they aren't good enough to be in the spotlight that way." ~ Sue Tompkins - Aspects in Astrology
Saturn in aspect to the sun is like a prison for proud self-expression.
These people can appear somewhat like a dog with a tucked in tail: feeling small and submissive whenever somebody criticizes them.
Sun and Saturn create performance anxiety: not just in the form of stage fright, but concerning all peformance in everyday life.
The best advice for this placement is the good old "don't worry what people think about you because they don't. Everybody else also merely worries about how they look."
With the hard aspects (conjunction, opposition, square) the fear of being shunned or sanctioned is especially inhibiting.
These people are cautious and can be quite prude, stuck up - the "bore" or "party pooper".
On the upside of this aspect there's an ability to be really focused on improving yourself. Those with Sun/Saturn aspects are disciplined and reliable. Although sometimes too pessimistic about themselves, they are pretty realistic and reliable otherwise.
Sun and Saturn will make a person conservative in the good sense of the word: they conserve values and have integrity.
Although they do take themselves very seriously and fear being insignificant, taking yourself seriously also means that you know yourself well and don't brush off injustice or disrespectful behavior directed at you.
An evolved expression of the Sun/Saturn aspect is a person that knows their own value and thus has high standards and is selective about what things and people are worth investing their time into. They have a clear sense of boundaries and don't let themselves be taken advantage of.
The Sun/Saturn person is typically the voice of reason and, once they are evolved enough to have a good sense of self-worth and confidence, they are the authoritative boss, the person in command.
At the same time, they are humble and non-pretentious. They are so secure in their self-esteem that they do not have to brag or be flashy.
They expect a lot from themselves, are ambitious, decision-makers and put in hard work to achieve their goals. They do not take the easy way out or make excuses. Instead, they are disciplined, independent and respectful of both themselves and others.
Although the hard aspects (conjunction, opposition, square) usually tend to show the more negative traits of the planetary combination and the soft aspects (trine, sextile) usually show the more positive ones, this is not necessarily the case.
The hard aspects bring so much tension that we are forced to grow and evolve. There is usually such a strong sense of insecurity that a person works very hard to build confidence from the inside and work on their skills and deserve respect from the outside.
On the other hand, the soft aspects flow easily and smoothly, so they come with a sense of laziness. People don't feel that being obedient is that bad, so they don't have a strong push that leads them to change. However, they are also less serious and insecure, and are mature from a young age.