Guru Nanak is regarded as the founder of Sikhism because a singular spiritual experience unfolded into a distinct path of faith, practice, and community. Around the age of thirty, while bathing in the river Bein near Sultanpur, he disappeared for three days and later spoke of having been taken to God’s court and entrusted with a divine mandate. Emerging from this experience, he proclaimed that established religious labels did not capture the truth of the Divine, emphasizing instead one formless Creator who transcends sectarian boundaries. From that point, his life became a sustained response to this revelation, and his message began to crystallize into a coherent spiritual vision.

Out of this revelation flowed teachings that were both simple in expression and radical in implication. He taught devotion to one God (Ik Onkar), the rejection of caste hierarchy and empty ritual, and the spiritual and social equality of all human beings, including women and those of low social status. He emphasized honest work, sharing with others, and continual remembrance of the Divine through meditation and prayer. These principles were not merely abstract doctrines; they were meant to shape daily conduct, turning ordinary life into a field of spiritual practice.

Guru Nanak’s message did not remain confined to one locality. Through extensive journeys, often described as udāsīs, he traveled across diverse regions, engaging with people of different religious backgrounds and inviting them into a direct relationship with the One. Over time, those who accepted his teachings began to understand themselves as Sikhs—disciples shaped more by this new orientation to God than by inherited Hindu or Muslim identities. In this way, a distinct community gradually took form around his words and example.

The founding impulse of Sikhism became fully embodied when Guru Nanak settled at Kartarpur. There he lived as a householder, demonstrating that spiritual realization need not require withdrawal from the world. He gathered a congregation (sangat) and instituted the communal kitchen (langar), where all sat and ate together without distinction of caste, status, or creed, giving concrete social expression to his vision of equality and shared humanity. These practices anchored his teachings in a visible, lived community.

Finally, his role as founder was sealed by the way he ensured continuity beyond his own lifetime. Rather than passing authority to his sons, he appointed Bhai Lehna as his successor, renaming him Guru Angad and thereby inaugurating a lineage of Gurus. This deliberate act transformed a circle of followers into an enduring tradition, with recognized spiritual leadership and a stable framework for preserving and deepening his message. Through revelation, teaching, community formation, and the establishment of succession, Guru Nanak’s life became the seed from which Sikhism emerged as a distinct religious path.