Few stripes - The Jews never inflicted more than forty stripes for one offence, Deuteronomy 25:3. For smaller offences they inflicted only four, five, six, etc., according to the nature of the crime. In allusion to this, our Lord says that he “that knew not” - that is, he who had comparatively little knowledge - would suffer a punishment proportionally light. He refers, doubtless, to those who have fewer opportunities, smaller gifts, or fewer teachers.
Much is given - They who have much committed to their disposal, as stewards, etc. See the parable of the talents in Matthew 25:14-30.