This paper deals with the conception of physical struggle in postils by Jakoubek of Stříbro (died 1429). A short tract De bellis included in the second redaction of gospel postil from years 1413 to 1414 is edited in the appendix.
Jakoubek used subjects of this text based on ideas of John Wycliffe in his postils until the twenties of the 15th century.