«I’ve just finished La flecha en el aire [The Arrow in the Air] by Ismael Grasa, and it makes me want to ask him if I can enrol as a student in his philosophy class.» Cristina Grande
«Ismael Grasa recounts his apprenticeship as a teacher, his philosophical doubts and certainties, and his convictions as a citizen, highlighting his exercise of intellectual honesty. I do not believe there are necessary books, but there are useful ones, and that is what this is: course in philosophy applied to life.» J. José Ordovás, La Vanguardia