The earliest found citation is in K.O. Meinsma, Spinoza en zijn kring. Historisch-kritische studiën over Hollandsche vrijgeesten (Martinus Nijhoff, 's-Gravenhage, 1896). This influential study was translated in French and German, but not in English. In the original Dutch context it seems as though this is not a quote from Huygens, but a characterisation by the author (Meinsma) of what 'could haven been' Huygens' devise.
In Cosmos: A Personal Voyage (Episode 6) from 1980 it is phrased The world is my country, science my religion.
Also in The Making of Modern Europe, 1648-1780 (1985) by Geoffrey Treasure, p. 474, it is declared that this was Huygens' "motto" — but this seems very similar to the much more famous and long attested declaration of Thomas Paine in Rights of Man (1791): "My country is the world, and my religion is to do good" which has long been paraphrased "The world is my country, and to do good is my religion."
Disputed
“My country is the world, and my religion is to do good.”
“The World is my country, all mankind are my brethren, and to do good is my religion.”
Commonly attributed to Paine, even on memorials https://commons.wikimedia.org/wiki/File:Thomas_Paine_Plaque_NY.jpg|, and justly describes his ideals, but found nowhere in his writings. It is actually is derived from a quote in Rights of Man: Part 2, "My country is the world, and my religion is to do good."
Misattributed
Part 2.7 Chapter V. Ways and means of improving the condition of Europe, interspersed with miscellaneous observations
Source: 1790s, Rights of Man, Part 2 (1792)
Context: I speak an open and disinterested language, dictated by no passion but that of humanity. To me, who have not only refused offers, because I thought them improper, but have declined rewards I might with reputation have accepted, it is no wonder that meanness and imposition appear disgustful. Independence is my happiness, and I view things as they are, without regard to place or person; my country is the world, and my religion is to do good.
Source: Thinking in Pictures: My Life with Autism
The Discover Interview: Lisa Randall (July 2006)
“My religion is humanitarianism, which is the basis of every religion in the world.”
quote published in Pakistan Studies Journal Pakistaniaat ( Vol. 3 No.2 of 2011 http://pakistaniaat.org/index.php/pak/article/view/129/129/). Retrieved on July 20, 2016
As quoted in Pontifical Science Academy http://www.ewtn.com/library/ISSUES/STELLAR.TXT
Source: Iranian Students News Agency, 2004 http://www.isna.ir/news/8307-08004/%D9%85%D8%AF%D9%8A%D8%A7-%D9%83%D8%A7%D8%B4%D9%8A%DA%AF%D8%B1-%D9%82%D8%B1%D8%A7%D8%B1-%D8%A8%D8%B1-%D8%A7%D9%8A%D9%86-%D9%86%D9%8A%D8%B3%D8%AA-%D9%83%D9%87-%D8%AA%D9%88%D8%B3%D8%B7-%D9%86%D9%88%D9%8A%D8%B3%D9%86%D8%AF%DA%AF%D8%A7%D9%86-%D8%A7%D9%8A%D8%B1%D8%A7%D9%86%D9%8A-%D8%B4%D8%A7%D9%87%D9%83%D8%A7%D8%B1
On the tax charges against him, in a speech at Foley Square in New York City (22 October 1981); published in a full page advertisement in the The New York Times (5 November 1981), as quoted in US Court of Appeals document U.S. v. Sun Myung Moon 718 F.2d 1210 (1983)
Hongkong, (2014)
Guan Yin Citta Dharma Door
Context: The Dharma is indeed a philosophy, science of the inner mind, essence of mandkind as well as the best remedy for the promotion of world peace. To practise Guan Yin Citta Dharma Door, one must act compassionately for the benefit of sentient beings, and endeavour to realise spiritual purification. We must love our family and our country, regard the percepts as the Master, practise cultivation both externally and internally in order to become a Buddha in the human realm. The fine Chinese culture and the essence of Buddhism are a good foundation of human morality. When we uphold traditional moral values, and practise compassion of the Bodhisattva, we will be smooth in life and in learning. It is hoped that all of you will be earnest in your practice of Buddhism. Perfection of humanity leads to the attainment of Buddhahood.
