must needs

It was a most painful situation; and, to understand it, one must needs experience it, or imagine himself in similar circumstances.

One of the young ladies asked Jo where she got the pretty drab hat she wore to the picnic and stupid Jo, instead of mentioning the place where it was bought two years ago, must needs answer with unnecessary frankness, “Oh, Amy painted it. You can’t buy those soft shades, so we paint ours any color we like. It’s a great comfort to have an artistic sister.”

But I myself eat, for I must needs now be strong for all.

Now the neglect of keeping our minds in such an equal frame, the not applying of our thoughts to consider of such matters of moment, as do highly concern a man to be rightly informed in, must needs be a vice.

Emilia in “Othello”: I must needs report the truth.