に他ならない
(Ni ta nara nai)
is nothing but / is exactly / is none other than.
Connection rules
- +Noun + に他ならない.
- +Emphatic identification — 'X is precisely Y, no other'.
- +Formal / literary register.
Examples
1.
これは努力の結果に他ならない。

Kore wa doryoku no kekka ni ta nara nai.
This is nothing but the result of effort.
「is nothing but / is exactly / is none other than」
2.
成功は運ではなく、準備に他ならない。

Seikou wa un de wa naku, junbi ni ta nara nai.
Success is not luck but preparation, nothing else.
「is nothing but / is exactly / is none other than」
Practice
His strictness is nothing but affection for his students.
彼の厳しさは、生徒への___。
Romaji also accepted