'Hard' in the Bible

My son, do not make your heart hard against the Lord's teaching; do not be made angry by his training:

The blessing of the Lord gives wealth: hard work makes it no greater.

The hater of work does not get his desires, but the soul of the hard workers will be made fat.

In all hard work there is profit, but talk only makes a man poor.

He who is hard on the poor puts shame on his Maker; but he who has mercy on those who are in need gives him honour.

Thorns are round the way of the hater of work; but the road of the hard worker becomes a highway.

The evil-doer makes his face hard, but as for the upright, he gives thought to his way.

Happy is the man in whom is the fear of the Lord at all times; but he whose heart is hard will come into trouble.

A man hating sharp words and making his heart hard, will suddenly be broken and will not be made well again.