confirmed habit

References in classic literature ?
Wopsle's great-aunt conquered a confirmed habit of living into which she had fallen, and Biddy became a part of our establishment.
Sabin - the old exile's hatred of using his title in a foreign country had become a confirmed habit with him - and mingled freely with the crowds who thronged into the restaurant at night.
If there were any sound at all, it was so slight that she must have fallen into a confirmed habit of listening for sounds; but Mr Dorrit believed he did hear a something, like the falling of dry leaves.