Jesus Christ is the same yesterday, today and forever.
That passage is talking about being faithful just as He is faithful, you incompetent.
Hebrews 13:5 Let your conversation be without covetousness; and be content with such things as ye have: for he hath said, I will never leave thee, nor forsake thee. 13:6 So that we may boldly say, The Lord is my helper, and I will not fear what man shall do unto me. 13:7 Remember them which have the rule over you, who have spoken unto you the word of God: whose faith follow, considering the end of their conversation. 13:8 Jesus Christ the same yesterday, and to day, and for ever. 13:9 Be not carried about with divers and strange doctrines. For it is a good thing that the heart be established with grace; not with meats, which have not profited them that have been occupied therein.
Romans 3:1 What advantage then hath the Jew? or what profit is there of circumcision? 3:2 Much every way: chiefly, because that unto them were committed the oracles of God. 3:3 For what if some did not believe? shall their unbelief make the faith of God without effect? 3:4 God forbid: yea, let God be true, but every man a liar; as it is written, That thou mightest be justified in thy sayings, and mightest overcome when thou art judged.
Malachi 3:6 For I am the LORD, I change not; therefore ye sons of Jacob are not consumed. 3:7 Even from the days of your fathers ye are gone away from mine ordinances, and have not kept them. Return unto me, and I will return unto you, saith the LORD of hosts. But ye said, Wherein shall we return?
Rom. 5:8