only later did i realize how quietly he listened to what i said as i ranted on and on about fra filippo : `` it 's delicate , it 's original , and yet it is commendable according to everybody 's rules , that 's the genius of it , to change , but not so much , to be inimitable , yet not beyond the common grasp , and that 's what he 's done , father , i tell you . ''