Ezequiel Rojas is recognized as one of the most important Colombian utilitarian thinkers of the nineteenth century. His writings, however, have been ignored or underestimated by philosophy historians in Colombia who read them from the perspective of European history of philosophy, class struggles or partisan issues —a reading which ignores the manner of local writings. The present text offers instead a reflection on the notion of “science” in Rojas’ philosophical works emphasizing the practice of localized “exercise of writing” (ejercicio de escribir), and thus provides a comprehensive view of his works as part of Colombian history of philosophy.