Chiron speaks about our inner wounds and traumas as well as repetitive behavior - these are all things that can block us from reaching our potential.

He's a very intelligent Teacher and Healer but he's also an outsider. Gaining understanding through experiences (the past) - to raise consciousness in the meaning of letting the inner knowing come to surface.

I also see, that he's talking about the difference between "self sacrifice" and "sacrifice to self".

The placement in a chart can give us information of how we try to "heal" ourselves in the sense of breaking repetitional behavior or any "wound" that might hold us back as it's THAT which we have to sacrifice by letting it go as a "lesson learned"... 

 

As a Centaur, Chiron behaves usually like an Asteroid but also got the qualities of a Comet - Chiron, just as Chariklo connect the realms of Uranus and Saturn...   

 

Greek Mythology:  Chiron was a son of Cronus and Philyra (a sea nymph) but was abandoned by his mother, due to his form. He was adopted by Apollon who taught him all his wisdom and he was further trained by Apollon's Twin Artemis. He became a master in an astonishing list of sciences and art-sciences. He then later taught Achilles. He was married to Chariklo and they had 3 Children together. Chiron was an outsider but became respected and honored due to his personality and his mastery. He accidentally got wounded and because he was immortal and couldn't heal himself, he gave up his immortality to save Prometheus life. Through this act he was healed and became a part of the Olymp.

 

Some Astronomy:   Chiron is a small Solar System body in the outer Solar System, orbiting the Sun between Saturn and Uranus. Discovered in 1977 by Charles Kowal, it was the first-identified member of a new class of objects now known as centaurs—bodies orbiting between the asteroid belt and the Kuiper belt.  Chiron's orbit was found to be highly eccentric (0.37), with perihelion just inside the orbit of Saturn and aphelion just outside the perihelion of Uranus. According to the program Solex, Chiron's closest approach to Saturn in modern times was around May 720. During this passage Saturn's gravity caused Chiron's semi-major axis to decrease from 14.55±0.12 AU to 13.7 AU. Chiron came to perihelion (closest point to the Sun) in 1996 and will reach aphelion mid 2021. Very interesting to note is, that Chiron is also classified as a Comet, due to his sometimes huge differences in brightness - he got a designation number as Comet as well as an minor planet - truly a "Centaur".....   (Ref. Wikipedia)