A human life is usefully spent when one leads it as an obedient Sikh of the True Guru and wins all its benefits. The feet are successful if they tread the path defined by the Guru.
The eyes are successful if they accept the omnipresence of the Lord and see Him everywhere. The forehead is successful if it touches the dust of the path tread by Satguru.
The hands are successful if they are raised in the salutation of Satguru and to write his utterances/compositions. The ears become successful by listening to the glory, adulations of the Lord and words of the Guru.
The congregation of holy and true souls attended by a Sikh is useful as it helps in uniting with the Lord. Thus abiding by the tradition of Naam Simran, he becomes aware of all the three worlds and the three periods. (91)