I read that they're not mentioned in SGGSJ. But the Sikh Rehat Maryada I wiki'd and found that http://en.wikipedia.org/wiki/Sikh_Rehat_Maryada If they are just merely scholars why should their word be followed? But then I read that Guru Gobind Singhji implemented them- http://en.wikipedia.org/wiki/The_Five_Ks Does that mean that are compulsory for a Sikh? Or would you say that Sikhi is more a state of mind? Or is it that you can be a sikh without them, but just not as devout as one with them? I'm not attacking the 5ks by the way, personally I think karas look cool and kirpans are terrific ideas.