1, Infinite Buddha: Literally understood as countless buddhas, Infinite is a quantifier with infinite meaning. Tianzun is a kind of honorific title given by Taoism to the deity it believes in. It is not correct to call the boundless Buddha directly, and the boundless Buddha cannot be used alone. The holy name correctly recited by Taoists should be boundless Buddha's blessing, which means that our blessing comes from countless Buddhas. Taoism has the word "three boundless", that is, infinite view, infinite life and infinite happiness, which can also be regarded as three boundless buddhas.
2. Buddha with infinite longevity: it is a complete Buddha title, which means that the blessing comes from your Buddha. There are many records and sources in the Taoist Collection, such as the longevity lamp instrument of the Beidou Shouhe Nuclear Monument and the Confessions of Crime Law in Yushu, Lei Ting. Reciting the boundless Buddha can remind people not to do it for the sake of goodness and not for the sake of evil. Only by doing real good deeds can they get shelter and guide people to do good deeds. To sum up, the boundless Buddha is just an empty quantifier, while the blessed Buddha is a specific title of Buddha, which has a specific religious significance and blessing effect. In Taoism, the blessed boundless Buddha is a commonly used holy name, which is used to express the admiration for the boundless Buddha and the desire to pray.