The needs of a missionary have been likened to an iceberg. What you can see above the surface is a very small part of the whole. Yet what we see above the surface is what most people focus on.
2 Thessalonians 3:1–3 KJV 1900
Finally, brethren, pray for us, that the word of the Lord may have free course, and be glorified, even as it is with you: And that we may be delivered from unreasonable and wicked men: for all men have not faith. But the Lord is faithful, who shall stablish you, and keep you from evil.