Persists

The most instinctive act of nearly every creature is to protect its young, and with humans, this response persists for a lifetime.

The devout Christian persists in his belief.

Jim persists in his opinion.

He persists in his opinion.

He persists in his confidence.

She persists in her belief.

She persists in saying that she is right.

She persists in saying that her analysis is correct.

My maternal grandmother persists in wearing that old-fashioned dress.

Newton's First Law says: "Every object persists in its state of rest or uniform motion in a straight line unless it is compelled to change that state by forces impressed on it".