Qui-Gon-Jin was the first jedi to find out how to talk inand through the force, we learnt this in starwars episode 3. As yoda and Obi-Wan were going into exile yoda had told Obi-Wan that there would be special training for him on the planet tatooine. And that an old friend had come bak to the jedi. Obi-Wan relised that it was Qui-Gon-Jin who had come back, that is how Obi-Wan learns to surrender to the force. Qui-Gon-Gin in episode 1 had been fighting with Darth Maul. They were in a saber lock when Darth Maul used the back of his light saber swung it arond and stabed Qui-Gon_Jin hin the gut.

Obi-Wan was infuriated at this point, when him and Darth Maul were fighting, Darth Maul pulled a cheap shot and kicked Obi-Whan into a hole. Qui-Gon-Jins light saber was in veiw of Obi-Wan, so Obi-Wan used force jump and force pulled Qui-Gon-Jins lightsaber to him, he then gashed through Darth Mauls waist and he died. The point of this is if it wasn't for Qui-Gon-Jin, Obi-Wan may not have won this fight against that freak Darth Maul.

Qui-Gon-Jins specialty was using lightsaber, but he had never come across a double lightsaber, so this was a challenge that Qui_Gon just coulden't beat, but he was the reason the chosen one would come to power. And the force was brought back as the prophacy had said mit would.