2 Peter 3:8

Ἓν δὲ τοῦτο μὴ λανθανέτω ὑμᾶς ἀγαπητοί ὅτι μία ἡμέρα παρὰ κυρίῳ ὡς χίλια ἔτη καὶ χίλια ἔτη ὡς ἡμέρα μία
But, beloved, be not of ignorant this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day.
Word Reference
Original Word Definitions
Ἓν
G1520 A-NSN
heis
one
  • one
δὲ
G1161 CONJ
de
but, and, etc
  • but, moreover, and, etc.
τοῦτο
G5124
touto
that thing
  • that (thing), this (thing)
μὴ
G3361 PRT-N
mē
(adverb) not, (conjunction) lest; also (as an interrogative implying a negative answer (whereas G3756 expects an affirmative one)) whether
  • no, not lest
λανθανέτω
G2990 V-PAM-3S
lanthanō
to lie hid (literally or figuratively); often used adverbially, unwittingly
  • to be hidden, to be hidden from one, secretly, unawares, without knowing
ὑμᾶς
G5209
hymas
you (as the objective of a verb or preposition)
  • you
ἀγαπητοί
G27 A-VPM
agapētos
beloved
  • beloved, esteemed, dear, favorite, worthy of love
ὅτι
G3754 ADV
hoti
demonstrative, that (sometimes redundant); causative, because
  • that, because, since
μία
G1520 A-NSF
heis
one
  • one
ἡμέρα
G2250 N-NSF
hēmera
day, i.e., (literally) the time space between dawn and dark, or the whole 24 hours (but several days were usually reckoned by the Jews as inclusive of the parts of both extremes); figuratively, a period (always defined more or less clearly by the context)
  • the day, used of the natural day, or the interval between sunrise and sunset, as distinguished from and contrasted with the night
    • in the daytime
      • "metaphorically, ___%___the day___%___ is regarded as the time for abstaining from indulgence, vice, crime, because acts of the sort are perpetrated at night and in darkness
    of the civil day, or the space of twenty four hours (thus including the night)"of the last day of this present age, the day Christ will return from heaven, raise the dead, hold the final judgment, and perfect his kingdom"used of time in general, i.e., the days of his life.
παρὰ
G3844 PREP
para
properly, near; i.e., (with genitive case) from beside (literally or figuratively), (with dative case) at (or in) the vicinity of (objectively or subjectively), (with accusative case) to the proximity with (local (especially beyond or opposed to) or causal (on account of)
  • from, of at, by, besides, near
κυρίῳ
G2962 N-DSM
kyrios
supreme in authority, i.e., (as noun) controller; by implication, Master (as a respectful title)
  • he to whom a person or thing belongs, about which he has power of deciding; master, lord
    • the possessor and disposer of a thing
      • the owner; one who has control of the person, the master
        • "in the state: the sovereign, prince, chief, the Roman emperor
      is a title of honor expressive of respect and reverence, with which servants salute their master"this title is given to: God, the Messiah
ὡς
G5613 CONJ
hōs
which how, i.e., in that manner (very variously used, as follows)
  • as, like, even as, etc.
χίλια
G5507 A-NPN
chilioi
a thousand
  • a thousand
ἔτη
G2094 N-NPN
etos
a year
  • year
καὶ
G2532 CONJ
kai
and, also, even, so then, too, etc.; often used in connection (or composition) with other particles or small words
  • and, also, even, indeed, but
χίλια
G5507 A-NPN
chilioi
a thousand
  • a thousand
ἔτη
G2094 N-NPN
etos
a year
  • year
ὡς
G5613 CONJ
hōs
which how, i.e., in that manner (very variously used, as follows)
  • as, like, even as, etc.
ἡμέρα
G2250 N-NSF
hēmera
day, i.e., (literally) the time space between dawn and dark, or the whole 24 hours (but several days were usually reckoned by the Jews as inclusive of the parts of both extremes); figuratively, a period (always defined more or less clearly by the context)
  • the day, used of the natural day, or the interval between sunrise and sunset, as distinguished from and contrasted with the night
    • in the daytime
      • "metaphorically, ___%___the day___%___ is regarded as the time for abstaining from indulgence, vice, crime, because acts of the sort are perpetrated at night and in darkness
    of the civil day, or the space of twenty four hours (thus including the night)"of the last day of this present age, the day Christ will return from heaven, raise the dead, hold the final judgment, and perfect his kingdom"used of time in general, i.e., the days of his life.
μία
G1520 A-NSF
heis
one
  • one

Ἓν δὲ τοῦτο μὴ λανθανέτω ὑμᾶς ἀγαπητοί ὅτι μία ἡμέρα παρὰ κυρίῳ ὡς χίλια ἔτη καὶ χίλια ἔτη ὡς ἡμέρα μία
8
But, beloved, be not of ignorant this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day.
Cross References

Psalms 90:4

כִּי אֶלֶף שָׁנִים בְּֽעֵינֶיךָ כְּיוֹם אֶתְמוֹל כִּי יַעֲבֹר וְאַשְׁמוּרָה בַלָּֽיְלָה׃
4
For a thousand years in thy sight are but as yesterday when it is past, and as a watch in the night.

Romans 11:25

Οὐ γὰρ θέλω ὑμᾶς ἀγνοεῖν ἀδελφοί τὸ μυστήριον τοῦτο ἵνα μὴ ἦτε παρ᾽ ἑαυτοῖς φρόνιμοι ὅτι πώρωσις ἀπὸ μέρους τῷ Ἰσραὴλ γέγονεν ἄχρις οὗ τὸ πλήρωμα τῶν ἐθνῶν εἰσέλθῃ
25
For I would that not, brethren, ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in.

1 Corinthians 12:1

Περὶ δὲ τῶν πνευματικῶν ἀδελφοί οὐ θέλω ὑμᾶς ἀγνοεῖν
1
Now concerning spiritual gifts, brethren, I would have not you ignorant.

1 Corinthians 10:1

Οὐ θέλω δὲ ὑμᾶς ἀγνοεῖν ἀδελφοί ὅτι οἱ πατέρες ἡμῶν πάντες ὑπὸ τὴν νεφέλην ἦσαν καὶ πάντες διὰ τῆς θαλάσσης διῆλθον
1
Moreover, brethren, I would not that ye should be ignorant, how that all our fathers were under the cloud, and all passed through the sea;
2 Peter 3:7
Read 2 Peter 3
2 Peter 3:9