We really need to spend time with people in order to teach them the word of God. That is one reason why Jesus himself put a lot of importance on teaching. There are usually many difficulties we face when we start to reach other nations with the gospel. First of all, language problems might stop us from sharing and teaching effectively with people we want to win for Christ. The best way to reach a country is by reaching them through nationals.
Nationals have no language and cultural problems.
They avoid mistakes that would naturally close doors for evangelism. After a contract on a ship, seafarers go back to their friends, relatives and neighbours and are able to share Christ with them. People will often listen even more carefully to them because they have missed them for a long time and now look forward to hear what they will tell them about their experiences they have made. First of all it will help to keep the contact alive. This is vital as we can only make disciples if we have a personal contact with a person.