The Greek word eis (generally translated for or unto) means "to express relation, to or towards... in regard to or of a purpose" (LS 231).
Throughout the Bible we find this word in some of the most significant places.
The Apostle Peter said, "38 Repent and be baptized every one of you in the name of Jesus Christ unto (Greek eis) the remission of your sins; and you shall receive the gift of the Holy Spirit' (Acts 2:38). The Greek word eis identifies the relationship that exists between baptism and the remission of sins. The Apostle Paul writes of Christ saying, "7 in whom we have our redemption through his blood, the forgiveness of our trespasses according to the riches of his grace" (Ephesians 1:7). Due to the use of the Greek word eis at Acts 2:38 1 can easily see the "relationship" between repentance, baptism, forgiveness of sins, redemption, and God's rich grace.
Jesus also used the Greek eis at Matthew 26 when instituting the Lord's Supper. Jesus said, "26 Take, eat; this is my body. 27 And he took a cup, and gave thanks, and gave to them, saying, Drink all of it; 28 for this is my blood of the covenant, which is poured out for many unto (Greek eis) remission of sins" (Matthew 26:26-28). The word eis helps us identify the relationship that exists between Christ's blood, the Lord's Supper, and the forgiveness of sins.
Understanding the use of the Greek eis can be very valuable to understanding much of the principles of the book of Romans.
Paul's apostleship is connected to people's obedient faith through preaching (see Romans 1:5). The relationship of obedience to faith is depicted in the phrase "faith unto (Greek eis) faith" at Romans 1:17).
Abraham's belief is related to righteousness at Romans 4:3. Then at Romans 6:16 the Greek eis identifies the relationship that exist between obedience and righteousness. Paul tells us that the Mosaic Law is related (eis) death at Romans 7:10).
The Apostle Paul writes, "For with the heart man believes unto (Greek eis) righteousness and with the mouth confession is made unto (Greek eis) salvation" (Romans 10:10). Paul affectively illustrates the relationship between belief and righteousness along with confession and salvation.
Understanding the relationship between words is very important. When I understand the relationship between faith and obedience, baptism and the forgiveness of sins, or faith and righteousness I begin to see my personal responsibility in the matter of God's grace. The Greek word eis inseparably connects these words together. If you or I were to dissolve that relationship we, in effect, have changed what God has said. To loose where God has not loosed or to bind where God has not bound is to set ourselves up as gods and this is the height of wickedness (see 2 Thessalonians 2:4).
John C Robertson