This is the 13550th most frequent Turkish word.
kudretinin
"Kudretinin" means "of his/her/its power or strength."
The word 'kudretinin' (of its power) refers to the possessive form of 'kudret' (power) linked to 'doğa' (nature)
Doğa, insanlara kudretinin büyüklüğünü gösterir.
Nature shows humans the greatness of its power.
Here, 'kudretinin' again signifies the possessive form of 'kudret' (power) attributable to 'ağacın' (of the tree).
Bahçede gördüğüm ağacın kudretinin inceliği beni şaşırttı.
The subtlety of the tree's power I saw in the garden surprised me.
In this sentence, 'evrenin kudretinin' represents the power possessively attributed to 'evren' (universe).