Shingon, as an esoteric form of Japanese Buddhism, is structured around a constellation of ritual and contemplative disciplines that aim at realizing Buddhahood in this very body. At the heart of its method lies the practice of the “Three Mysteries” (sanmitsu), in which body, speech, and mind are harmonized with the body, speech, and mind of the cosmic Buddha, Mahāvairocana (Dainichi Nyorai). This is enacted through mudrā, the symbolic hand seals that embody specific Buddhas and deities; mantra and dhāraṇī, the sacred syllables and formulas chanted to invoke and align with Buddha energies; and focused mental visualization, especially of deities, mandalas, and oneself as inseparable from the Buddha. Through this triadic discipline, the practitioner does not merely contemplate enlightenment as an abstract ideal, but ritually enacts it as an embodied, vocal, and mental reality.

A distinctive feature of Shingon is its extensive use of mandalas as both visual and contemplative frameworks. Two great mandalas are central: the Womb Realm (Taizōkai), expressing the compassionate, generative matrix of enlightenment, and the Diamond Realm (Kongōkai), expressing unshakable wisdom and ultimate reality. Practitioners contemplate and visualize these mandalas, entering imaginatively into their worlds and identifying with the deities that populate them, sometimes in highly formalized ritual settings. Within this mandala-based vision, practices of “deity yoga” arise, in which one visualizes oneself as a particular esoteric deity while uniting this visualization with the corresponding mantra and mudrā, thereby working toward the non-duality of ordinary self and Buddha-body.

Among the more contemplative techniques, Ajikan, the meditation on the Sanskrit letter “A” (阿), holds a privileged place. This single seed syllable, often visualized on a moon disc and associated with Dainichi Nyorai, is treated as a symbol of the fundamental nature of reality, emptiness, and original suchness. By concentrating on this syllable, the practitioner is guided to recognize the unity of all phenomena within the Buddha-body and to see that enlightenment is not something imported from outside, but disclosed from within one’s own inherent Buddha-nature. Such meditation is supported by regular liturgical recitation, including sutras, mantras, hymns, and dedications of merit, which weave esoteric contemplation into the fabric of daily life.

Ritual plays an equally prominent role, especially in the form of abhiṣeka (kanjō), the esoteric initiations that establish a karmic connection with Dainichi and the lineage. Through these empowerments, often performed with mandalas, water, and flowers, practitioners receive authorization and capacity to engage particular practices or deities at deeper levels. The Goma (homa) fire ritual is another hallmark: offerings are cast into a consecrated fire while mantras are chanted, with the intention of purification, removal of obstacles, protection, healing, prosperity, and the transfer of merit. Alongside these, Shingon maintains a rich repertoire of ritual offerings, funereal and ancestor rites, and protective ceremonies, all grounded in the same triad of mantra, mudrā, and visualization.

Underlying these esoteric methods is a strong emphasis on ethical and devotional foundations. Observance of bodhisattva precepts and related vows is regarded as indispensable for the efficacy of esoteric practice, ensuring that the powers cultivated through mantra, mudrā, and visualization are oriented toward compassion and wisdom rather than self-centered aims. Study of key esoteric scriptures, such as those centered on Dainichi and the Diamond Realm, and participation in practices like pilgrimage, further situate the individual within a living tradition. Taken together, these disciplines form an integrated path in which ritual precision, contemplative depth, and moral commitment converge to reveal the practitioner’s own life as an expression of the cosmic Buddha.