'Difficult' in the Bible

A friend loves at all times,and a brother is born for a difficult time.

The words of a man’s mouth are like deep waters [copious and difficult to fathom];The fountain of [mature, godly] wisdom is like a bubbling stream [sparkling, fresh, pure, and life-giving].

A brother offended is more difficult than a fortified city; and disputes are like the bars of a castle.

If you do nothing in a difficult time,your strength is limited.