Should a deacon be apt to teach?

The New Testament sets forth qualifications for two types of office bearers in the church, elders and deacons. The qualifications for deacons are most fully set forth in 1 Timothy 3:8-13. The New Testament nowhere states that deacons should be apt to teach. Paul states that elders should be "able to teach" (1 Tim. 3:2) and to exhort and rebuke according to sound doctrine (Titus 1:9), but the same requirements are not laid upon deacons--although Paul's insistence that deacons "hol[d] the mystery of the faith with a pure conscience" (1 Tim. 3:9 NKJV) implies that deacons should have some knowledge of the truth of the gospel (cf. Col. 1:25-27).