Understanding the Significance of Arketos in Greek

ἀρκετός means “sufficient.” In the New Testament it appears in teaching that frames what is enough for a day, enough for a disciple, and enough time already spent in a former way of life.

Root and Related Words

ἀρκετός (Arketos) corresponds to the verb arkeō (ἀρκέω), “be sufficient” (Strong’s G714), from which it derives.

Occurrences

“Therefore don’t be anxious for tomorrow, for tomorrow will be anxious for itself. Each day’s own evil is sufficient.” (Matthew 6:34)

Here ἀρκετός sets a limit around the day’s burden: “Each day’s own evil is sufficient.” The sentence does not deny that a day has “evil”; it marks that the day already has enough of it without importing “tomorrow” into today’s concerns. In the flow of thought, the word reinforces the practical boundary implied by “Each day’s own…”—the day is treated as a unit with its own load, and that load already meets the measure of what is sufficient for that day. The force is not mathematical but ethical and pastoral: the claim “is sufficient” underwrites the admonition “don’t be anxious for tomorrow” by naming today’s difficulty as already filling the quota.

“It is enough for the disciple that he be like his teacher, and the servant like his lord. If they have called the master of the house Beelzebul, how much more those of his household!” (Matthew 10:25)

In this saying, ἀρκετός anchors what counts as an adequate expectation for a learner and a servant: “It is enough for the disciple that he be like his teacher, and the servant like his lord.” The sufficiency is defined relationally (“like his teacher… like his lord”), not by status or comfort. The second sentence then develops the implication: if the “master of the house” receives abusive labeling, “how much more” will those associated with him receive it. Within that logic, “enough” functions as a threshold for realism about discipleship. The word sets the disciple’s standard at resemblance and belonging, and it prepares the hearer to accept that shared treatment—especially hostile treatment—fits within what is “enough” for someone aligned with a master.

“For we have spent enough of our past time doing the desire of the Gentiles, and having walked in lewdness, lusts, drunken binges, orgies, carousings, and abominable idolatries.” (1 Peter 4:3)

Here ἀρκετός evaluates elapsed time: “we have spent enough of our past time” in a catalog of behaviors. The term does not describe the behaviors as sufficient in any positive sense; it marks that the time already expended reaches a point of sufficiency—enough to make the continuation unwarranted. The phrase “past time” places the “enough” behind the reader, and the list (“lewdness, lusts, drunken binges, orgies, carousings, and abominable idolatries”) gives concrete weight to what has already filled that measure. The word thus acts as a moral boundary marker: the former life has consumed a sufficient portion of time, and the statement implies a decisive break without needing to narrate it explicitly in this sentence.

Sense and Usage

Across these passages, ἀρκετός consistently speaks of a measure that reaches adequacy—an amount that meets the standard so that more is neither required nor fitting. The contexts show three different “units” that can be assessed as sufficient. In Matthew 6:34 the unit is a day and its “own evil”; sufficiency defines the day as already full, shaping how one relates to time and worry. In Matthew 10:25 the unit is a disciple’s expectation; sufficiency defines what counts as an adequate aim (“be like his teacher”) and sets a sober baseline for what treatment one may receive as part of the master’s household. In 1 Peter 4:3 the unit is time already spent; sufficiency defines the past as having reached its limit, especially when that time was given over to “desire” expressed in a pattern of vice.

Two features stand out in how the word operates. First, ἀρκετός often works with a genitive idea of possession or relation—“Each day’s own evil,” “the disciple… his teacher,” “our past time”—so that what is sufficient is not an abstract quantity but a defined share belonging to a specific sphere. That makes sufficiency a boundary within relationships and periods of life: today has its share, the disciple has his pattern, the past has its allotted stretch. Second, in all three places sufficiency is paired with a tacit prohibition against adding more: do not add tomorrow’s anxieties to today; do not demand a better lot than association with the master entails; do not extend the old way of living beyond the time already squandered on it. The adjective therefore carries a practical decisiveness. It draws a line, not to minimize hardship or excuse sin, but to state that the present measure already meets the criterion of adequacy.

Imagery

The imagery surrounding ἀρκετός is concrete: a day with its built-in trouble, a household with a master and those under his roof, and a life-history measured in “past time.” In each case, sufficiency evokes a filled measure—today already full, the disciple’s calling already defined, the past already spent—so the reader is invited to live within the proper limits that the moment and the relationship establish.

Sources: Lexical data from Strong’s Exhaustive Concordance and the Translators Brief Lexicon of Extended Strongs for Greek (STEPBible, CC BY). Occurrence data from the Translators Amalgamated Greek New Testament (STEPBible, CC BY). Scripture quotations from the World English Bible (public domain).