Commentaries:
Robertson's Word Pictures (NT)
Unto you (eiv umav). Like the dative umin (Textus Receptus) as in the papyri and modern Greek (Robertson, Grammar, p. 594).
For my name's sake (dia to onoma mou). See verse John 15:20. See this same warning and language in Matthew 10:22; Mark 13:13; Matthew 24:9; Luke 21:17). There is little difference in meaning from eneken mou (Mark 13:9; Luke 21:12). Loyalty to the name of Christ will bring persecution as they will soon know (Acts 5:41; Philippians 1:29; I Peter 4:14). About the world's ignorance of God see Luke 23:34; Acts 3:17; John 16:3.
Other Robertson's Word Pictures (NT) entries containing John 15:21:
Luke 22:36
John 8:55
John 16:3
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