Gandalf, the wise man

"true courage is knowing not how to take a life, but when to spare it"
"Gandalf"

The effort of Gandalf  trying to make Bilbo a better person, a better fighter and a better adventurous, makes Gandalf  told to Bilbo one of his most wiser phrases. This act is cause of the good relationship that Gandalf has had with the family of Bilbo Bolson, for the example the relationship that Gandalf had with the Old Tuk, the Grandfather of Bilbo, they were buddy-buddy, they had a lot of adventures together.

Gandalf defending Bilbo from the jokes of Thorin

In my opinion, Gandalf in the book is like a father trying to protect and save Bilbo, but also trying to make him pass a good adventure,  the way Gandalf defend him from the joke of the dwarves, also in the part when the Gandalf and the dwarves got out of the cave of the Trasgos, before Bilbo gots out behind the trees, Gandalf asked with preoccupation where was Bilbo, and many others act that make sure the big relationshipthat Gandalf had with Bilbo without knowing each other very good .

Bilbo taking the sword that Gandalf gave to him

In my opinion,  the reason why Gandalf  gave that advice to  Bilbo was to gave him a lesson of how good can be an adventure forgiving lives instead of   taking  lives. In conclusion, the dearness that Gandalf had with Bilbo in the journey is not compared with dearnees that Gandalf had with the dwarves,  verified by the differents dearness action in the differents moments of the book that Gandalf had with Bilbo
 

Bilbo forgiving Thorin for all offense

Other character in which Gandalf had a good relationship was with Thorin, not with standing the arrogance of Thorin, Gandalf always was worried of him, and like a good friend, Gandalf tried to make Thorin more humble, Gandalf also tried to take out the bad blood that Thorin had against the elves,  and the hatred Thorin
had against Bilbo, the hobbit,  and almost in the final of the book Thorin changed his character radically, and began to had a good relationship with Bilbo Bolson.

Gandalf enduring the arrogance charater of Thorin

The good relationship that Gandalf had with Thorin, in my opinion, also was because Gandalf to manyadventures with the Grandfather and with the father of Thorin, That was what made Gandalf to had respect, that was what make Gandalf did not humilliate Thorin by his arrogance.

The king of the Trasgos, the new enemy of Gandalf

Did Gandalf has enemies ?. Other important point, in my opinion, Gandalf did not has enemies, the uniques characters in the book that had enemies were the dwarves, but when Gandalf decide to help the dwarves he began to had the same enemies of the dwarves.