Tathātā is variously translated as "thusness" or "suchness". It is a central concept in Mahayana Buddhism having a particular significance in Chan Buddhism as well. The synonym dharmatā is also often used. While alive the Buddha referred to himself as the Tathāgata, which can mean either "One who has thus come" or "One who has thus gone", and can also be interpreted as "One who has arrived at suchness".
Tathātā in the East Asian Mahayana tradition is seen as representing the base reality and can be used to terminate the use of words. A 5th-century Chinese Mahayana scripture entitled "Awakening of Faith in the Mahayana" describes the concept more fully: R. H. Robinson, echoing D. T. Suzuki, conveys how the Laṅkāvatāra Sūtra perceives dharmata through the portal of śūnyatā: "The Laṅkāvatāra is always careful to balance Śūnyatā with Tathatā, or to insist that when the world is viewed as śūnya, empty, it is grasped in its suchness."
Chan Buddhism
In Chan stories, tathātā is often best revealed in the seemingly mundane or meaningless, such as noticing the way the wind blows through a field of grass, or watching someone's face light up as they smile. According to Chan hagiography, Gautama Buddha transmitted the awareness of tathātā directly to Mahākāśyapa in what has come to be rendered in English as the Flower Sermon. In another story, the Buddha asked his disciples, "How long is a human life?" As none of them could offer the correct answer he told them "Life is but a breath". Here we can see the Buddha expressing the impermanent nature of the world, where each individual moment is different from the last. Molloy states, "We know we are experiencing the 'thatness' of reality when we experience something and say to ourselves, 'Yes, that's it; that is the way things are.' In the moment, we recognize that reality is wondrously beautiful but also that its patterns are fragile and passing." The Thiền master Thích Nhất Hạnh wrote, "People usually consider walking on water or in thin air a miracle. But I think the real miracle is not to walk either on water or in thin air, but to walk on earth. Every day we are engaged in a miracle which we don't even recognize: a blue sky, white clouds, green leaves, the black, curious eyes of a child--our own two eyes. All is a miracle."
