'Stern' in the Bible

I was [always] afraid of you, because you are a stern man; you pick up what you did not lay down and you reap what you did not sow.’

He said to the servant, ‘I will judge and condemn you by your own words, you worthless servant! Did you [really] know that I was a stern man, picking up what I did not lay down and reaping what I did not sow?