I request you to clear one of my doubts. You have mentioned the following:
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/sikh-sikhi-sikhism/666-guru-granth-sahib-history-arrangements-text.html

1708 - Granth Sahib was declared as the spiritual Guru of the Sikhs by Guru Gobind Singh, at Nanded.

My doubt. Are Sikhs required to attach the same importance to Dasham Granth or other writings of the wise and knowledgeable persons?

I am confident you will clear my doubt soon.

Regards,

Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=666
Manmohan.
Sevadaar.