This is the 61st most frequent Russian word.
жизни
The word "жизни" in English means "life" (genitive or dative singular, or nominative plural form).
Here, 'жизни' ('life') is used in a possessive form to describe its quality or truth.
Без труда не вытащишь и рыбку из пруда, такова правда жизни.
You cannot pull even a fish out of the pond without effort, such is the truth of life.
Here, 'жизни' ('life') is referring to existence in general, emphasizing its abstract value.
В этих трудностях проявляется настоящая ценность жизни.
In these difficulties, the true value of life is manifested.
'жизни' ('life') in this context is used to reference the personal experiences and story of a specific individual.