The only thing we have to fear is fear itself
ainus as^ɪ midɑ meil karta on on hirm isɛ
In Estonian Ainus asi, mida meil karta on, on hirm ise
This is a direct translation of the original quote.
Example
"Rasketel aegadel tuletas ta meelde: 'Ainus asi, mida meil karta on, on hirm ise'."