strength, might, muscle
Ischys names the kind of strength you can see and measure. It is physical force, bodily capacity, the raw power a person or creature actually possesses. When a Greek speaker reached for ischys, they were pointing at something concrete: the muscles of a laborer, the stamina of a soldier, the structural might of a city wall. It is strength as a present, tangible resource rather than an abstract quality.
But the biblical authors stretched this word in a crucial direction. In the Septuagint, ischys often translates the Hebrew koach and chayil, words that carry the full weight of vitality and valor. So ischys absorbs that freight. It stops being merely physical and starts describing the full capacity of a being to exert force in the world, whether that being is a man, an army, or God himself.
In the New Testament, ischys appears most powerfully in the command to love God with all your ischys (Mark 12:30, drawing from Deuteronomy 6:5). There the word demands that your bodily, muscular, practical energy be surrendered to God, not just your feelings or your theology. It also shows up in doxologies (Revelation 5:12, 7:12) where creatures ascribe ischys to the Lamb, declaring that all force and capacity in the cosmos belongs to him. Peter uses it when urging ministry done in the strength God supplies (1 Peter 4:11). The word keeps insisting that real strength has a source, and that source can either be held tightly or offered up.
Most of us read the Shema command, love God with all your strength, and quietly translate it as enthusiasm. We think it means try really hard or feel it deeply. I did that for years. But ischys will not let you go that soft. It means your physical reserves, your work hours, your bodily energy, the part of you that gets tired. Jesus is quoting a command that says your gym membership, your labor, your calendar, the calories you burn belong to this love. That is a harder word than sentiment. It asks whether the strongest version of you is pointed toward God or quietly hoarded for yourself.
Ischys derives from the Proto-Indo-European root related to physical holding and containing power. It belongs to the same word family as ischuo, the verb meaning "to be strong" or "to be able," and katischuo, meaning "to overpower" or "to prevail." Enischuo means to strengthen or reinforce. This semantic family runs through the New Testament consistently pointing at active, demonstrated capacity rather than latent potential.
Where ischys appears in Scripture, and why each verse showcases it.
And you shall love the Lord your God with all your heart and with all your soul and with all your mind and with all your strength.
Ischys is the word behind 'strength' here, and Jesus makes it the fourth and final dimension of total love, anchoring the command in bodily, practical capacity rather than letting it float into pure feeling.
saying with a loud voice, 'Worthy is the Lamb who was slain, to receive power and wealth and wisdom and might and honor and glory and blessing!'
Ischys appears here translated as 'might,' placed in a sevenfold doxology that attributes every category of force and capacity to the slaughtered Lamb, declaring that all strength in creation belongs to him.
whoever serves, as one who serves by the strength that God supplies, in order that in everything God may be glorified through Jesus Christ.
Peter uses ischys to name the supply line behind all Christian ministry, insisting that the strength you bring to service is not your own reserve but a resource God furnishes.
saying, 'Amen! Blessing and glory and wisdom and thanksgiving and honor and power and might be to our God forever and ever! Amen.'
A second doxological use of ischys in Revelation, this time from an innumerable multitude, reinforcing that all might is ascribed upward to God and not retained by creatures.
Finally, be strong in the Lord and in the strength of his might.
Paul combines kratos and ischys here in a phrase that layers different textures of power, and ischys grounds the exhortation in concrete, muscular capacity that believers draw from the Lord rather than from themselves.
Words in the same semantic family.
Every video where Adam teaches on this word, in publication order.
