I request you to clear one of my doubts. You have mentioned the following:

1708 - Granth Sahib was declared as the spiritual Guru of the Sikhs by Guru Gobind Singh, at Nanded.
Read More:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=666 (Guru Granth Sahib - The History, Arrangements and Text)

My doubt. Are Sikhs required to attach the same importance to Dasham Granth or other writings of the wise and knowledgeable persons?
Read More:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=666 (Guru Granth Sahib - The History, Arrangements and Text)

I am confident you will clear my doubt soon.

Regards,

Manmohan.
Sevadaar.