The author, Dr. Fernando A. Bernardo, himself a scientist of note, writes in the preface that much has been said about the Filipino-Spanish war and Filipino heroes and martyrs during the revolution. He thus spent 16 months in researching and writing about "unsung heroes, martyrs, and great men and women in times of peace," who had "raging storms that took place in (their) minds . . .who, through their noble thoughts, dreams, sacrifices, and actions, made some impact on the country and the Filipino people."
In Silent Storms, Dr. Bernardo classifies his subjects under several ca-tegories, that is, as pre-19th century Filipinos; poets, writers and journalist; educators; statesmen; nationalists, crusaders and revolutionists; medical doctors, nurses and social workers; artists; scientists; businessmen/entrepreneurs; religious leaders; dramatists and movie producers, and sportsmen.
Some of the subjects are widely known, but there are facets in their lives which indicated raging silent tempest in their minds, and these had to do with helping their countrymen and barangay folk, and Mother Country.
Two of the pre-19th century subjects were Muslims, whose stories as told by Dr. Bernardo, put the resistance movement of Muslims in Mindanao in heroic lights. These were Sultan Abubakar (Circa 1425-1495), founder of the Sultanate of Sulu, and Sultan Kudarat (Circa 1581-1671), the "greatest and strongest Mindanao sultan that ever lived," unyielding to the Spanish colonials, "a hero in defense of the Islam faith, the champion of liberty of Southern Philippines."
A third Muslim, falling under statesmen, was Hadji Butu Abdul Bagui of Sulu, who, writes Bernardo, "holds that distinction of having broken down our Muslim brothers resistance to integration into the Filipino nation." He did all he could to pacify his Muslim brothers who resisted Spanish colonization. He once said: "Mindanao and Sulu are like a small vinta towed by the Philippine ship of state. Wherever the bigger ship goes, the vinta follows. We want to be side by side with our Christian brothers, laboring for the welfare of the Philippines, guided by one common ideal, and bound by one common tie."
Three women are in Bernardos list of educators Rosa Sevilla Alvero, Librada M. Avelino, and Francisca Tirona-Benitez. Geronima Pecson falls under the category of statesman, Pura Villanueva-Kalaw under nationalists, crusaders and revolutionists Josefa Llanes Escoda, Maria Paz Mendoza Guazon, Josefa Jara-Martinez, Anastacia Giron-Tupas, under medical doctors, nurses and social workers. Under artists are Francisca Reyes-Aquino and Jovita Fuentes, and scientists, Maria Y. Orosa and Carmen C. Velasquez. Margarita Roxas de Ayala is listed among the entrepreneurs.
Guevara, on the other hand, had a shoemaker copy imported footwear, and by studying and implementing techniques in shoe production, developed Marikinas shoe industry made up of industrious household factories. The Marikina Shoe Producers Association erected a mo-nument to his memory in 1954.