Dr Kent Brantly met with President Obama weeks after he was flown home to the US for treatment.
He was a medical director for US-based Christian charity Samaritan's Purse and became ill while working at a care centre in the Liberian capital of Monrovia.
The 33-year-old was discharged from a hospital in Atlanta at the end of August after receiving experimental treatment, and he thanked God for his recovery.
He said: "Many, including one of the senators today, used the analogy of a fire burning out of control to describe this unprecedented Ebola outbreak.
"Indeed it is a fire; it is a fire straight from the pit of hell."
After the meeting, President Obama said: "I had a chance to see Dr Brantly in the Oval Office this morning.
"And although he is still having to gain back some weight, he looks great, he looks strong and we are incredibly grateful to him and his family for the service he has rendered to people who are a lot less lucky than all of us."
The president used the meeting to highlight the danger Ebola poses to the world.
He said the virus was "spiralling out of control" and is "getting worse".
He is now sending 3,000 troops to West Africa to help build medical centres. The US also aims to train 500 medical staff a week.
Bekah Legg from the Christian charity, Compassion told Premier's Marcus Jones on the 'News Hour' that situation was turning desperate.
She said: "The numbers, where they were remaining fairly static, and although the disease was ongoing, they've really begun to escalate at a quite alarming rate - so they are going from having a few cases a week to I think at the moment about 500 new cases reported each week."
The UN says one billion dollars is needed to fight Ebola, with the virus claiming nearly 2,500 lives so far, mostly in Liberia, Sierra Leone and Guinea.
Bekah Legg, Compassion: