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:Philemon 1:11, Ὀνήσιμον—ἄχρηστον—εὔχρηστον ''Onesimon—achreston—euchreston''. Onesimus in Greek literally means "profitable". In the Greek New Testament, "useless" is ἄχρηστον achrēston, and "useful" is εὔχρηστον euchrēston. The prefix "a-" is a negative, meaning "not-". The prefix "eu-" is a positive, meaning "good-". The phrase in the Greek text of Philemon verse 11 is: τόν ποτέ σοι '''ἄχρηστον''' , νυνὶ δὲ καὶ σοὶ καὶ ἐμοὶ '''εὔχρηστον'''  

:Philemon 1:11, Ὀνήσιμον—ἄχρηστον—εὔχρηστον ''Onesimon—achreston—euchreston''. Onesimus in Greek literally means "profitable". In the Greek New Testament, "useless" is ἄχρηστον achrēston, and "useful" is εὔχρηστον euchrēston. The prefix "a-" is a negative, meaning "not-". The prefix "eu-" is a positive, meaning "good-". The phrase in the Greek text of Philemon verse 11 is: τόν ποτέ σοι '''ἄχρηστον''' , νυνὶ δὲ καὶ σοὶ καὶ ἐμοὶ '''εὔχρηστον'''  

:Matthew 16:18 σὐ εἶ '''Πέτρος''' (a huge rock), καὶ ἐπὶ ταύτῃ τῇ '''πέτρᾳ''' (huge boulder, rock) οἰκοδομήσω μου τὴν ἐκκλησίαν.<ref>See Strong's numbers [http://biblehub.com/greek/4073.htm ''4073''] and [http://biblehub.com/greek/4074.htm''4074'']. Curiously, Strong's definition of "small rock, pebble", is inaccurate: "''properly, a stone (pebble), such as a small rock found along a pathway''". Protestant Greek scholars like D.A. Carson and Joseph Thayer admit there is no distinction in meaning between petros and petra in the Koine Greek of the New Testament. [Joseph H. Thayer, Thayer’s Greek-English Lexicon of the New Testament (Peabody: Hendrickson, 1996), 507; D.A. Carson, “Matthew,” in Frank E. Gaebelein, ed., The Expositor’s Bible Commentary (Grand Rapids: Zondervan, 1984), vol. 8, 368.] According to Greek linguists, ''petra'' means a ‘rock’, usually a ‘large rock’ which is the same exact Greek meaning of petros — large rock. It does not mean ‘pebble’ or ‘small stone’. The Greek word for ‘pebble’ or ‘small stone’ is ''lithos'', not ''petros''.

:Matthew 16:18 σὐ εἶ '''Πέτρος''' (a huge rock), καὶ ἐπὶ ταύτῃ τῇ '''πέτρᾳ''' (huge boulder, rock) οἰκοδομήσω μου τὴν ἐκκλησίαν.<ref>See Strong's numbers [http://biblehub.com/greek/4073.htm ''4073''] and [http://biblehub.com/greek/4074.htm''4074'']. Curiously, Strong's definition of "small rock, pebble", is inaccurate: "''properly, a stone (pebble), such as a small rock found along a pathway''". Protestant Greek scholars like D.A. Carson and Joseph Thayer admit there is no distinction in meaning between petros and petra in the Koine Greek of the New Testament.  

:*Joseph H. Thayer, '''Thayer’s Greek-English Lexicon of the New Testament''' (Peabody: Hendrickson, 1996), 507

:*D.A. Carson, “'''Matthew''',” in Frank E. Gaebelein, ed., '''The Expositor’s Bible Commentary''' (Grand Rapids: Zondervan, 1984), vol. 8, 368.  

According to Greek linguists, ''petra'' means a ‘rock’, usually a ‘large rock’ which is the same exact Greek meaning of petros — large rock. It does not mean ‘pebble’ or ‘small stone’. The Greek word for ‘pebble’ or ‘small stone’ is ''lithos'', not ''petros''.

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If, as seems probable, our Lord spoke in Aramaic, the word used would be ''Kepha'' (בֵּיפָא, compare Hebrew בֵּפִים in Jeremiah 4:29, Job 30:6 = ‘rocks’; see Strong's number [http://biblehub.com/greek/2786.htm ''2786'']). Aramaic makes no grammatical difference in masculine and feminine forms for "rock" as does Greek. "''You are Kepha, and on this kepha I will build my church''". This is the reading in the ancient Syriac ''Peshitta'' translation of the New Testament.

If, as seems probable, our Lord spoke in Aramaic, the word used would be ''Kepha'' (בֵּיפָא, compare Hebrew בֵּפִים in Jeremiah 4:29, Job 30:6 = ‘rocks’; see Strong's number [http://biblehub.com/greek/2786.htm ''2786'']). Aramaic makes no grammatical difference in masculine and feminine forms for "rock" as does Greek. "''You are Kepha, and on this kepha I will build my church''". This is the reading in the ancient Syriac ''Peshitta'' translation of the New Testament.