You [and] other Bhikṣus, [when] seeking good-knowing friends, [and] seeking good protective helpers, none [are] like not forgetting mindfulness. If [there are] those not forgetting mindfulness, all afflictions’ thieves [are] then not able [to] enter. Therefore, you [and] others, constantly should gather [the] thoughts in [your] minds.
If [there are] those losing mindfulness, [they will] then lose all meritorious virtues.
If [there are] those losing mindfulness, [they will] then lose all meritorious virtues. If mindfulness’ power [is] strong, although entering five desires’ thieves [of (1) wealth, (2) sex, (3) fame, (4) food and (5) sleep (财色名食睡)] within, [they are] not by them harmed. For example, like wearing armour entering battlefields, then without that [to] fear. These [are] named [as teachings on] not forgetting mindfulness.
The Sūtra Of The Buddha’s Bequeathed Teachings