'Steadfastly' in the Bible

If anyone serves Me, he must [continue to faithfully] follow Me [without hesitation, holding steadfastly to Me, conforming to My example in living and, if need be, suffering or perhaps dying because of faith in Me]; and wherever I am [in heaven’s glory], there will My servant be also. If anyone serves Me, the Father will honor him.

I assure you and most solemnly say to you, anyone who believes in Me [as Savior] will also do the things that I do; and he will do even greater things than these [in extent and outreach], because I am going to the Father.