Who is a Sikh?

A 'Sikh' is a spiritual man, longing to lead a holy and pious life, in accordance with the teachings enshrined in Guru Granth Sahib, the holy scripture. After disciplining his body, mind and soul, he becomes a detached person (a jeevan-mukta) so far as the material luxury of life is concerned, and devotes his rest of life in the service of mankind. In a very authoritative book which depicts the teachings of Guru Nanak and Guru Granth Sahib, written by Sir Jogendar Singh and Raja Sir Daljit Singh, a 'Sikh' is portrayed as described below------
Most people profess to love others, but they only love their own selves; a few love those who love them, but a devotee of the Guru, a sikh, must love all, even those who hate him.
The whole world works for gain, only a few work, because it is their duty to work; only a rare one works without any desire for a return. But a sikh of the Guru must serve friends and foes alike, knowing that it is only thus he can serve God.
Everyone lives for the sake of the self. Some share what they gain with others. A rare one finds enjoyment in giving to others, a true devotee of the Guru a sikh, must live entirely for others.
People endeavor to promote their interest, by aggressiveness. A rare one works for all humanity. A sikh of the Guru rejoices in carrying out the will of God.
Most people want their own name to be exalted. A few want their friends to be exalted. Their are a few who desire neither name nor fame. A sikh of the Guru exalts the name of God, without any sense of self.
Thus after defining who is a sikh, we will enter into the subject, how to become a sikh by practicing spiritualism through five domains as enunciated by Guru Nanak in his eternally proclaimed hymn known as "jupji sahib".(Being published shortly)