Jedi -- Aayla Secura by John Ostrander puts it pretty well.

Tholme: Our Padawans learn from us, An'ya, and not always the lessons we expect. How could you connect with Aurra Sing when you yourself are not comfortable with connections? You never have been.
Dark Woman: A Jedi must not form attachments, Tholme.
Tholme: Attachments, no. But our strength comes from our connections to the Force . . . and each other. It is those connections that help make us who we are.