自分の信念を

one's beliefs

→ 自分
phrase Rare #33,733
one's beliefs 自分の means “one's own,” 信念 means “beliefs” or “convictions,” and を marks the phrase as the object of a verb. This phrase is normally followed by a verb such as 守る (to protect) or 貫く (to stick to).
JA: 彼は自分の信念を決して曲げない。
EN: He never compromises his beliefs.

彼女は常に自分の信念を弁護している

She always stands up for her beliefs.

自分の信念を隠すくらいなら死んだほうがましだ

I’d rather die than hide my beliefs.

彼女はいつも自分の信念を守る

She always stands by her beliefs.