始終如一

unswerving from start to finish (idiom)

to begin / to start / then / only then

from beginning to end / all along

end / finish

as / as if / such as

consistent / the same / unvarying

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit