Kabir was a 15th-century Indian poet and mystic who played a significant role in the Bhakti movement of India. He expressed his ideas through his poetry and songs, which were written in Hindi and influenced by both Hindu and Islamic traditions. Kabir's teachings focused on the idea of a Supreme God and the path to attaining divine realization. His major ideas can be summarized as follows:

1. Unity of God: Kabir emphasized the concept of a single, formless and omnipresent God. He rejected the divisions created by religious and social boundaries and preached the unity of all beings under the divine.

2. Rejecting Rituals and Dogmas: Kabir criticized the rituals and dogmas associated with organized religions. He believed that true spirituality lies in direct personal experience with God rather than in external practices.

3. Importance of Devotion: Kabir stressed the significance of devotion (bhakti) as a means to connect with the divine. He advocated for sincere and heartfelt devotion as opposed to empty rituals or superficial displays of faith.

4. Equality and Brotherhood: Kabir strongly advocated for equality and brotherhood among all human beings. He condemned discrimination based on caste, religion, or social status and emphasized the idea that all individuals are equal in the eyes of God.

5. Inner Divinity: According to Kabir, the divine resides within every individual. He encouraged people to seek the divine within themselves rather than searching for it in external objects or places of worship.

Kabir expressed these ideas through his poetry, which was simple yet profound. His verses were often filled with metaphors, allegories, and paradoxes, making them accessible to people from various backgrounds. Kabir's poetry was sung and recited, allowing his teachings to reach a wider audience. His compositions were aimed at inspiring individuals to embark on a personal spiritual journey and to seek a direct connection with the Supreme Being.

Overall, Kabir's major ideas centered around the concepts of unity, devotion, equality, and inner divinity. Through his poetry, he sought to break down barriers and guide individuals towards a deeper understanding of the divine.