“I am not the first Buddha who came upon Earth, nor shall I be the last. In due time, another Buddha will arise in the world - a Holy One, a supremely enlightened One, endowed with wisdom in conduct, auspicious, knowing the universe, an incomparable leader of men, a master of angels and mortals.”
Help us to complete the source, original and additional information
Gautama Buddha 121
philosopher, reformer and the founder of Buddhism -563–-483 BCRelated quotes
http://www.rediff.com/news/2004/apr/12inter.htm.
Buddhas of Bamyan

Gautama Buddha in Digha Nikaya as quoted in Avatars down the ages by Felicity Elliot http://www.shareintl.org/archives/AgelessWisdom/aw_fe-Avatars.htm
Source: Pali Canon, Sutta Pitaka, Digha Nikaya (Long Discourses)

Source: Problems Of Humanity (1944), p. 150/1

"Shoaku makusa : Not Doing Wrong Action" http://wwzc.org/dharma-text/shoaku-makusa-not-doing-wrong-action as translated by Anzan Hoshin roshi and Yasuda Joshu Dainen roshi (2007)
Master Jun Hong Lu - Ambassador of Peace Education https://www.youtube.com/watch?v=BrZUen8PMVI&feature=youtu.be&list=PLU6NSq1Oq8pxTDav8m7__9IVbfqlTPB4C&t=175, YouTube, 2016
Guan Yin Citta Dharma Door