Commentaries:
Robertson's Word Pictures (NT)
I kept (ethroun). Imperfect active of threw, "I continued to keep."
I guarded (efulaca). First aorist (constative) active of fulassw. Christ was the sentinel (fulac, Acts 5:23) for them. Is he our sentinel now?
But the son of perdition (ei mh o uiov thv apwleiav). The very phrase for antichrist (II Thessalonians 2:3). Note play on apwleto, perished (second aorist middle indicative of apollumi). It means the son marked by final loss, not annihilation, but meeting one's destiny (Acts 2:25). A sad and terrible exception (Mark 14:21).
The scripture (h grafh). It is not clear whether this is John's own comment or the word of Jesus. Not in John 18:9. The Scripture referred to is probably Psalms 41:9 quoted in John 13:18 with the same formula ina plhrwqh which see there.
Other Robertson's Word Pictures (NT) entries containing John 17:12:
John 3:16
John 5:43
John 6:37
John 10:28
John 12:36
John 13:18
John 17:1
John 17:6
John 18:9
2 Thessalonians 2:3
1 John 5:18
Revelation 3:10
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