'Necessary' in the Bible

For divisions are necessary among you, in order that those who have God's approval may be clearly seen among you.

No, those parts which seem to be feeble are the more necessary;

But when that which is complete is come, then that which is in part will be no longer necessary.

Foolish man, it is necessary for the seed which you put into the earth to undergo death in order that it may come to life again:

On the first day of the week, let every one of you put by him in store, in measure as he has done well in business, so that it may not be necessary to get money together when I come.