[2] He was raised in the French language and learned Dutch at the Catholic seminary of Annappes where he began his studies in 1922.
[4] However, the VVF gradually became more separatist in its politics, and over time abandoned French regionalism as its ideology and increasingly associated with the Greater Netherlands movement, which considered the French Flemish as a part of a single Dutch race, the Dietse volk.
[4] The French military authorities banned the VVF after the outbreak of World War II.
Because of his vocal Flemish nationalism and perceived extremism, Gantois was relieved of his sacramental duties by Cardinal Achille Liénart.
[6] Gantois continued promoting Flemish nationalism by writing, mainly for the magazine Notre Flandre ("Our Flanders"), until his death in Holque, Nord in 1968.