"Let it be done" is an English equivalent of the Latin word Fīat. It represents the third person singular form of both the active and the passive present subjunctive even though its use is English is as a noun, not a verb. The pronunciation will be "FEE-at" in Church and classical Latin.
"He" is English is the personal pronoun is in Latin.
The verb est in Latin is "is" in English.
Testamentum in Latin is "testament" or "will" in English.
"Short" in English is brevis in Latin.
"Mind" in English is mens in Latin.
Quī in Latin means "what" or "which" or "who" in English.
Infernus in Latin is "hellish" in English.
M in Latin is "1,000" in English.
"Family" in English is familia in Latin.
"Life" in English is vita in Latin.
"Humility" in English is humilitas in Latin.
"Are you with me?" in English is Estis cum me? or Estis mecum? in Latin.