John 1:9

[Now] the true Light, who enlightens all mankind, was [indeed] coming into the world [i.e., to earth].

1 John 2:8

Yet, I am [also] writing to you about a new commandment [Note: This commandment was to love one another as Jesus loved them. See John 13:34]; its truth is [being demonstrated] by Christ [perfectly] and [also] by you people [in a lesser measure], because the darkness [of sin] is passing away, and the real light [of righteousness] is already shining [in people's lives].

John 1:4

PM if Jewish time were meant].

John 12:46

I have come into the world to be a light [to it], so that whoever believes in me would not have to remain in [spiritual] darkness.

Matthew 6:23

But if your eye sees things wrongly, [then] your whole body [i.e., your entire life] will be full of darkness [i.e., will not be lived properly]. If therefore, the light you have is [really] darkness [i.e., if you are not seeing life properly], that darkness will be very great [i.e., you cannot possibly live properly].

John 1:7

He came to be a witness, so that he might testify concerning that Light, so that all people would believe [in Jesus] through him [i.e., through his testimony. See Acts 19:4].

John 6:32

So Jesus said to them, "Truly, truly, I tell you, it was not [really] Moses who gave you the bread from heaven, but it is my Father who is [now] giving you the real bread from heaven.

John 7:12

And there was much whispering about Him among the crowds. Some were saying, "He is a good man," [but] others said, "No [he is not], he is [just] deceiving the crowd."

John 14:6

Jesus answered him, "I am the way [to God], and the truth [to believe], and the life [to live]. No one can go to the Father, except through [believing in] me.

John 15:1

[Jesus continued], "I am the real vine, and my Father is the owner of the vineyard.

1 Thessalonians 5:4-7

But you brothers are not in the dark about that day, so that it sneaks up on you like a thief,

1 John 1:8

If we claim to have no sinful practices [in our lives], we are self-deceived and are not being truthful about the matter.

1 John 5:20

And [in addition], we know that the Son of God has come [in a physical body, See 4:2] and has given us understanding, so that we can know the True One [i.e., God], and that we are in [fellowship with] the True One, even His Son Jesus Christ. This Son is the true God and eternal life.

Treasury of Scripture Knowledge

Summary

That was the true Light, which lighteth every man that cometh into the world.

Bible References

The true

John 1:4
Life existed in Him; and that Life [was what] enlightened mankind [spiritually].
John 6:32
So Jesus said to them, "Truly, truly, I tell you, it was not [really] Moses who gave you the bread from heaven, but it is my Father who is [now] giving you the real bread from heaven.
John 14:6
Jesus answered him, "I am the way [to God], and the truth [to believe], and the life [to live]. No one can go to the Father, except through [believing in] me.
John 15:1
[Jesus continued], "I am the real vine, and my Father is the owner of the vineyard.
Matthew 6:23
But if your eye sees things wrongly, [then] your whole body [i.e., your entire life] will be full of darkness [i.e., will not be lived properly]. If therefore, the light you have is [really] darkness [i.e., if you are not seeing life properly], that darkness will be very great [i.e., you cannot possibly live properly].
1 John 1:8
If we claim to have no sinful practices [in our lives], we are self-deceived and are not being truthful about the matter.
1 John 2:8
Yet, I am [also] writing to you about a new commandment [Note: This commandment was to love one another as Jesus loved them. See John 13:34]; its truth is [being demonstrated] by Christ [perfectly] and [also] by you people [in a lesser measure], because the darkness [of sin] is passing away, and the real light [of righteousness] is already shining [in people's lives].
1 John 5:20
And [in addition], we know that the Son of God has come [in a physical body, See 4:2] and has given us understanding, so that we can know the True One [i.e., God], and that we are in [fellowship with] the True One, even His Son Jesus Christ. This Son is the true God and eternal life.

Every

John 1:7
He came to be a witness, so that he might testify concerning that Light, so that all people would believe [in Jesus] through him [i.e., through his testimony. See Acts 19:4].
John 7:12
And there was much whispering about Him among the crowds. Some were saying, "He is a good man," [but] others said, "No [he is not], he is [just] deceiving the crowd."
John 12:46
I have come into the world to be a light [to it], so that whoever believes in me would not have to remain in [spiritual] darkness.
1 Thessalonians 5:4
But you brothers are not in the dark about that day, so that it sneaks up on you like a thief,