Several pivotal experiences in Sri Ramakrishna’s life gradually crystallized into the core of his later teachings. From childhood, he was marked by spontaneous mystical ecstasies and visions, especially in relation to the Divine Mother, which gave him an unshakable conviction about the reality and immediacy of God. These early samādhi-like states, reinforced by the loss of his father and the simplicity of village life, oriented his mind away from worldly ambitions and toward an all-consuming spiritual quest. They formed the experiential bedrock for his later insistence that God is not a mere concept but a living presence that can be directly realized.

His appointment as priest at the Kali temple in Dakshineswar provided the setting in which this inner disposition matured into a life of radical God-centeredness. Immersed in ritual worship and ceaseless prayer to Mother Kali, he passed through periods of intense longing, often weeping and crying out for a direct vision of the Divine. These practices culminated in repeated samādhi and vivid visions of the Divine Mother, shaping his teaching that God can be realized “as tangibly as this” when yearning is wholehearted. Under the guidance of Bhairavi Brahmani, he undertook various Tantric and Vaiṣṇava disciplines, exploring different devotional moods and ritual forms, which led him to affirm that diverse methods of worship, when pursued sincerely, can all lead to the same realization.

Another decisive phase was his training under the non-dualist monk Totapuri, who initiated him into the path of nirguṇa Brahman and led him to the experience of nirvikalpa samādhi. This realization of the formless Absolute, alongside his abiding devotion to the Divine Mother, gave rise to his distinctive teaching that both the personal God and the impersonal Absolute are equally real aspects of the one Reality. Later, by practicing Islam and Christianity with full concentration—meditating on Allah and on Christ and having corresponding visions—he came to the experiential conviction that all genuine religions lead to the same divine truth. From these disciplines emerged his celebrated emphasis on the harmony of religions and the unity underlying their varied symbols and practices.

His marriage to Sarada Devi and his life at Dakshineswar further refined the practical side of his message. The marriage evolved into a relationship of spiritual companionship and purity, with Sarada Devi eventually embodying for many the ideal of divine motherhood that he so often extolled. Living as a poor temple priest, dependent on providence and yet frequently in contact with wealthy patrons and educated seekers, he learned to speak to both renunciants and householders. This experience informed his counsel to live in the world while remaining inwardly unattached, to see every woman as a manifestation of the Divine Mother, and to place God at the center of all activities.

In his later years, as disciples such as Narendranath (later Swami Vivekananda) gathered around him, his life became a living commentary on his realizations. He emphasized direct spiritual experience over mere book-learning, taught through simple parables and personal example, and encouraged service to living beings as a form of worship of God. Even during his final illness, he continued to train his disciples intensively, urging them toward renunciation, purity, and the ideal of serving all as manifestations of the Divine. Through these intertwined events—early visions, rigorous sādhana in multiple paths, non-dual realization, interreligious practice, spiritual marriage, and the training of disciples—his teachings on the reality of God, the harmony of religions, the unity of personal and impersonal aspects of the Divine, and the sanctity of selfless service took their definitive shape.