Original sentence: They say that for a spanking to be educational it must be perceived as logical and just: the spankee must know what exactly it is for, the severity fitting the 'crime,' preferably according to previous warnings; and the threat should be systematically carried out, not whimsically, nor the severity altered without justification.Up until the mid-20th century it was perfectly acceptable in most communities for a spanking to cause a child to cry in pain throughout and have trouble sitting down afterward, even leaving stripes or bruises for days, sometimes even lasting scars
Edited sentence: They say that for a spanking to be educational it must be perceived as logical and just:  the spankee must know what exactly it is for, the severity fitting the 'crime,' preferably according to previous warnings; and the threat should be systematically carried out, not whimsically, nor the severity altered without justification.Up until the mid-20th century it was perfectly acceptable in most communities for a good hard spanking to cause a child to cry in pain throughout and have trouble sitting down afterward, even leaving stripes or bruises for days, sometimes even lasting scars