Commemorative T-shirts celebrate 400-year anniversary of Gurū Arjan Sāhibís introduction of divine wisdom articulated in the Ādi Granth in 1604. This wisdom, as gifted to the world, has been captured in the compilation of revelatory writings known as the Gurū Granth Sāhib, a text paid utmost reverence in the Sikh community Ė ordained the spiritual authority of Sikhs by Gurū Gobind Singh in 1708.