There were other Jedi out there, Luke just knew it. Now if only he could find them, gather them together again under one roof so that they could set about training more Jedi, and even Luke himself. For if the Jedi were truly gone, Luke felt like he would know, but if they were and he was truly alone, then the job seemed almost impossible, he wasn't sure if he would ever be able to train anyone properly. If he couldn't he would rather let the Jedi die with him then set a Sith Lord on their first path to destruction.
He had heard tales of one who could have possibly been a Jedi, that had started the spark that started the rebellion. He needed to find this Kanan, he might be able to train Luke how to be a Jedi Knight. Yes he had had Ben and Yoda, but neither of them had been around long enough to truly teach him everything he needed to know to keep himself, and anyone he may someday train, from getting to close to the dark side.
"R2, it looks like this guy Kanan spent a lot of time on Lothal, let's see what we can find out by visiting there." "You leaving us already?" came the voice of his sister Leia, "Luke you just defeated our father, can't you stay and celebrate one more day?" "I told you Leia, I didn't really defeat him, I helped him come back to the right side is all. And yes, I need to start looking for other Jedi. Now that the Empire is on its way to defeat without its ruler, the Jedi can come out of hiding and help restore balance to the galaxy."
Leia sighed and said "I can't say I understand Luke, cause really I don't, but go and do what you must. Stay safe and come back to us." Luke smiled and kissed her cheek before saying "I will. Say goodbye to Hans and Chewie for me. Take care of 3PO, I will be back for him. Come on R2, lets go to Lothal." Leia waved at Luke until he was out of sight, before returning to the celebration.