enlightenment leads to serenity
A Buddhist yojijukugo expressing the idea that attaining nirvana brings true peace. Used in doctrinal contexts; not an everyday expression.
See also: 四法印 (しほういん)
Nirvana's tranquility is considered one of the Four Dharma Seals in Buddhism.
The Four Dharma Seals, of which 涅槃寂静 is one component.
From Buddhist terminology; 涅槃 (nirvana) and 寂静 (tranquility, serenity). The exact historical derivation is uncertain, but the phrase is a standard doctrinal expression.