So here goes one of the most respected Bushido philosophers - Yamamoto Tsunetomo, the author of Hagakure.
Yes, he probably did not use such A4 sort of pieces of paper for writing, drawing and calligraphy, probably it were scrolls or special "notebooks", but I understood it only when I finished the picture
Hagakure was written down by a student of his btw, not by himself.
So this is the theme quote:
"Even if one's head were to be suddenly cut off, he should be able to do one more action with certainty. With martial valor, if one becomes like a revengeful ghost and shows great determination, though his head is cut off, he should not die.