"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.
The verb est in Latin is "is" in English.
Testamentum in Latin is "testament" or "will" in English.
"Mind" in English is mens in Latin.
"Short" in English is brevis in Latin.
Quī in Latin means "what" or "which" or "who" in English.
M in Latin is "1,000" in English.
Infernus in Latin is "hellish" in English.
"Life" in English is vita in Latin.
"Humility" in English is humilitas in Latin.
"Family" in English is familia in Latin.
Dominus; magister.