"Teacher" is an English equivalent of the Latin word magister. The masculine singular noun took on the meaning "master" with a license to teach liberal arts and philosophy at the university level in the Middle Ages. The pronunciation will be "ma-GEE-ster" in ancient Latin and "MA-djee-ster" in Church Latin.
"He" is English is the personal pronoun is in Latin.
M in Latin is "1,000" in English.
Quī in Latin means "what" or "which" or "who" in English.
"Mind" in English is mens in Latin.
Testamentum in Latin is "testament" or "will" in English.
Infernus in Latin is "hellish" in English.
"Humility" in English is humilitas in Latin.
"Life" in English is vita in Latin.
"Family" in English is familia in Latin.
"Short" in English is brevis in Latin.
The verb est in Latin is "is" in English.
Dominus; magister.