Nationalism is an infantile disease. It is the measles of mankind.

The quote by Albert Einstein, "Nationalism is an infantile disease. It is the measles of mankind," uses the metaphor of a disease to criticize nationalism, which he saw as an immature and harmful force. By referring to nationalism as an "infantile disease," Einstein suggests that nationalism is a primitive, undeveloped idea that hinders global progress and unity. The comparison to measles implies that nationalism is something that spreads easily but is ultimately damaging and a sign of societal immaturity.

Einstein’s statement reflects his belief in internationalism and the idea that humanity should prioritize global cooperation and unity over divisive national borders and identities. He viewed nationalism as a source of conflict and division among people, often leading to war and hatred. For Einstein, the rise of extreme nationalism could impede the development of a peaceful and collaborative global society, where nations work together for the common good.

The quote is a part of Einstein's broader philosophy of promoting peace, tolerance, and humanity's shared responsibility to one another. His criticism of nationalism aligns with his support for human rights, disarmament, and efforts to transcend parochial interests in favor of a united world. Einstein believed that the blind loyalty to one’s own country at the expense of others was an immature worldview that needed to be outgrown.

In essence, Einstein’s quote is a call for maturity in how people relate to one another across national lines. It challenges the tribal mentality associated with nationalism and urges people to look beyond their immediate borders to embrace a more universal perspective that promotes understanding and solidarity.