The Greek verb anadeiknymi means "to show forth clearly," "to proclaim," or "to appoint by public designation." In the New Testament it is used of Jesus appointing the seventy-two (Luke 10:1) and of Matthias being appointed to the apostolate (Acts 1:24).
The use of anadeiknymi for both the appointment of the seventy-two and Matthias reveals that divine calling is always a public, declared act — it is shown forth, displayed, made visible. The Lord publicly designated His workers. Divine appointment is real, recognizable, and carries accountability.