Scriptural proofs that the Bible teaches universal salvation. See –

http://www.tentmaker.org/books/ScripturalProofs.html

http://www.tentmaker.org/books/Bible-Proofs-modern.html

Also see four scriptural expositions supporting UR at
http://concordant.org/expohtml/HumanDestiny/doubts.html

http://concordant.org/expohtml/HumanDestiny/1cor15.html

http://www.godstruthfortoday.org/Library/knoch/ReplyToUniversalismRefuted/refuted1.htm
(copy and paste on address bar in two sections if necessary) and ----

http://concordant.org/expohtml/TheEons/index.html

Regarding the most common argument that the same word for "punishment" is also used for "life" see the following:
All three of these articles should be studied with care, especially the red one.

http://concordant.org/expohtml/TheEons/eon1.html
http://concordant.org/expohtml/TheEons/eon2.html
http://concordant.org/expohtml/TheEons/eon3.html

also see

http://concordant.org/expohtml/TheEons/aion.html
http://concordant.org/version/tranprin.html

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