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This verse is from the Bhagavad Gita, Chapter 6, Verse 14. It is written in Sanskrit and translates to English as follows:
praśhāntātmā vigata-bhīr brahmachāri-vrate sthitaḥ
manaḥ sanyamya mach-chitto yukta āsīta mat-paraḥ || 14 ||
"A peaceful-minded person, free from fear, situated in the vow of celibacy, having controlled the mind and focused on Me, remains devoted to Me."
Prashantatma: Peaceful-minded
Vigatbhih: Free from fear
Brahmachari-vrate: In the vow of celibacy
Sthita: Situated
Manah Sanyamya: Having controlled the mind
Macchittah: Focused on Me
Yuktah: Engaged
Aasit: Remains
Matparah: Devoted to Me