Varro’s De Lingua Latina 5.23
“Terra (earth) is, the same as humus (soil). Thus, they say that Ennius meant “to the earth” when he said: “they were striking the soil with their elbows”. Because the earth is soil, the man who is dead and covered with earth (terra) is said to be inhumed (humatus).
Based on this correlation, if some Roman is cremated and if his burial place is not covered with clods of earth or if a bone has been excluded for the purification of the family of the dead, the family remains in mourning until the bone or body is covered by soil (humus) for the purpose of purification—the period of time during which, as the priests say, the body is uncovered [or exhumed? Inhumatus]. Also, a man who inclines toward the soil (humus) is called “more humble”; the lowest character is called most humble (humillimus) because the humus (soil) is the lowest thing in the world.”
Terra, ut putant, eadem et humus; ideo Ennium in terram cadentis dicere:
Cubitis pinsibant humum; et quod terra sit humus, ideo is humatus mortuus, qui terra obrutus; ab eo qui Romanus combustus est, si in sepulcrum, eius abiecta gleba non est aut si os exceptum est mortui ad familiam purgandam, donec in purgando humo est opertum (ut pontifices dicunt, quod inhumatus sit), familia funesta manet. Et dicitur humilior, qui ad humum, demissior, infimus humillimus, quod in mundo infima humus.