A.T. Robertson Commentary Matthew 24:14

"And this gospel of the kingdom shall be preached in the whole world for a testimony unto all the nations; and then shall the end come." — Matthew 24:14 (ASV)

Shall be preached (κερυχθησετα). Heralded in all the inhabited world. Εν ολη τη οικουμενη supply γη. It is not here said that all will be saved nor must this language be given too literal and detailed an application to every individual.