'Necessary' in the Bible

I did not take you with me when I went away from Crete, so that you might do what was necessary to put things in order there, placing men in authority over the churches in every town, as I said to you;

For it is necessary for a Bishop to be a man of virtue, as God's servant; not pushing himself forward, not quickly moved to wrath or blows, not desiring profit for himself;

And let our people go on with good works for necessary purposes, so that they may not be without fruit.