"Kabir the poet broke the barriers  between Hinduism and Islam by going to the heart of religion. As Jesus says: "The kingdom of God is within you", so Kabir sings about an intoxicated state; where the is one with the "beloved", with God. God can be experienced; as heaven is a state of mind, not a place. "
(Rajender Krishan)   

"Kabir was the most celebrated revolutionary saint of the Bhakti movement. He condemned social and religious abuses and emphasized the fundamental equality and fraternity of all mankind. Kabir was born to a widowed Brahmin on Jaeth Sudi 15 sunmat 1455. However, his mother left the new born baby next to a water pool near Banaras. Ali (Niru), a local weaver found the baby. Ali and his wife Nima together brought up this child as their own son. Child was named Kabir in accordance with the Muslim traditions of the time. Further, Kabir was educated in Islam studies. Kabir married Lohi and a son, Kamaal, was born. Brought up in a weaver's family of Banaras, Kabir joined the Bhakti fold under Swami Ramanand's Influence. Thinking that being a low-caste he might not be considered fit to receive initiation, he lay prostrate one day, early in the morning, in the path which Ramanand used to follow while going to his bath. When the Swami's feet touched Kabir's body, he uttered the words 'Ram, Ram'. The saint affectionately lifted him and made him his disciple. Thereafter, Kabir got so deeply absorbed in meditation that he began to dwell habitually in the realms of the spirit. Kabir has so blended with God. That none can distinguish him from his Lord. A staunch believer in the worth of constructive human endeavour, Kabir was opposed alike to ritualism and asceticism. He sought to enlighten the benighted humanity. In those days the Indian society was rife with communal dissensions. Undaunted by opposition, Kabir fought against all the vicious influences. He pulled up the Pundits, the Kazis and the Mullas and inveighed against the Jogis and Sadhus. This act enraged the Muslim Mullanas who had him arrested, in sunmat 1547, by complaining to the King Sikandar Lodi that Kabir had been preaching what ran counter to the Islamic canon. Once an attempt was made to drown him in the Ganges; and, on another occasion, he was thrown before a drunken elephant to be crushed to death, nevertheless, Kabir remained unperturbed even in the face of this great calamity. Eventually, he became the leader of the Bhakti Movement. While expounding his life's aim, he declared that he was a worshipper of the godly and an enemy of the wicked and that it was his desire to spend all his time in communion with God: The passion of his life was to enjoy a spell of unbroken intercourse with the Lord. 'KabirPanthis.' or the followers of Kabir, with their headquarters at Kanshi, constitute an important sect. Their holy book Kabir Bijak is well known. Kabir's contribution to the Adi Granth, comprising 541 different verses arranged under 17 different ragas, exceeds that of any other bhakt. And in the absence of any other reliable manuscript, it remains the most authentic and precious part of his work.

(Ref. "Guru Granth Ratnavali," (pp. 109) by Dr. D.S. Mani, Sardar Bakhshish Singh, and Dr. Gurdit Singh)