'Harder' in the Bible

would you therefore wait until they were grown? Would you therefore refrain from marrying? No, my daughters; for it is harder for me than for you, for the hand of the Lord has gone forth against me.”

A brother offended is harder to be won than a strong city,And contentions are like the bars of a citadel.

O Lord, do not Your eyes look for truth?You have smitten them,But they did not weaken;You have consumed them,But they refused to take correction.They have made their faces harder than rock;They have refused to repent.

Like emery harder than flint I have made your forehead. Do not be afraid of them or be dismayed before them, though they are a rebellious house.”