We must confess that Jesus is Lord

If you confess with your mouth that Jesus is Lord
and believe in your heart that God raised him from the dead,
you will be saved.
For one believes with the heart and so is justified,
and one confesses with the mouth and so is saved.
The Scripture says,
No one who believes in him will be put to shame.
There is no distinction between Jew and Greek;
the same Lord is Lord of all,
enriching all who call upon him.
For everyone who calls on the name of the Lord will be saved.

Romans 10:9-13

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He called the crowd with his disciples, and said to them,
“If any want to become my followers,
let them deny themselves and take up their cross and follow me.
For those who want to save their life will lose it,
and those who lose their life for my sake,
and for the sake of the gospel, will save it.
For what will it profit them to gain the whole world
and forfeit their life?
Indeed, what can they give in return for their life?
Those who are ashamed of me and of my words
in this adulterous and sinful generation,
of them the Son of Man will also be ashamed
when he comes in the glory of his Father with the holy angels.”

Mark 8:34-38

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What shall it profit, my brethren,
if a man say he hath faith, but hath not works?
Shall faith be able to save him?

And if a brother or sister be naked, and want daily food:
And one of you say to them:
Go in peace, be ye warmed and filled;
yet give them not those things
that are necessary for the body, what shall it profit?

So faith also, if it have not works, is dead in itself.

But some man will say: Thou hast faith,
and I have works: shew me thy faith without works;
and I will shew thee, by works, my faith.

Thou believest that there is one God.
Thou dost well: the devils also believe and tremble.

But wilt thou know, O vain man,
that faith without works is dead?

James 2:14-20

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Faith without works and works without faith will both alike be condemned, for he who has faith must offer to the Lord the faith which shows itself in actions. Our father Abraham would not have been counted righteous had he not offered its fruit, his son (c.f. James 2:21; Romans 4:3).

St. Diadochos of Photki
On Spiritual Knowledge