始終如一

To begin or start; then or only then; formerly or once; initially or originally.

To end or finish; the end or conclusion; the final moment; death; also used as a surname.

As; like; as if; as though; to go to; to reach; to compare with; to follow; to obey; to conform to; indicating an example.

The number one; single; a; as soon as; entire; whole; all; a "one" radical in Chinese characters; also used for clarity when spelling out numbers.