Verses with the word secret in the New Testament (13 verses):

Matthew 6:4
That thine alms may be in secret: and thy Father which seeth in secret himself shall reward thee openly.

Matthew 6:6
But thou, when thou prayest, enter into thy closet, and when thou hast shut thy door, pray to thy Father which is in secret; and thy Father which seeth in secret shall reward thee openly.

Matthew 6:18
That thou appear not unto men to fast, but unto thy Father which is in secret: and thy Father, which seeth in secret, shall reward thee openly.

Matthew 13:35
That it might be fulfilled which was spoken by the prophet, saying, I will open my mouth in parables; I will utter things which have been kept secret from the foundation of the world.

Matthew 24:26
Wherefore if they shall say unto you, Behold, he is in the desert; go not forth: behold, he is in the secret chambers; believe it not.

Mark 4:22
For there is nothing hid, which shall not be manifested; neither was any thing kept secret, but that it should come abroad.

Luke 8:17
For nothing is secret, that shall not be made manifest; neither any thing hid, that shall not be known and come abroad.

Luke 11:33
No man, when he hath lighted a candle, putteth it in a secret place, neither under a bushel, but on a candlestick, that they which come in may see the light.

John 7:4
For there is no man that doeth any thing in secret, and he himself seeketh to be known openly. If thou do these things, shew thyself to the world.

John 7:10
But when his brethren were gone up, then went he also up unto the feast, not openly, but as it were in secret.

John 18:20
Jesus answered him, I spake openly to the world; I ever taught in the synagogue, and in the temple, whither the Jews always resort; and in secret have I said nothing.

Romans 16:25
Now to him that is of power to stablish you according to my gospel, and the preaching of Jesus Christ, according to the revelation of the mystery, which was kept secret since the world began,

Ephesians 5:12
For it is a shame even to speak of those things which are done of them in secret.