可翻译为：Be loyal to one's own faith
或：Be steadfast in one's own faith
或：stick by one's own beliefs
或：hold to one's own convictions 等等。
列相关例句如下：
1.She was loyal to her faith.
她忠于自己的信念。
2.He is steadfast in his faith.
他坚守自己的信念。
3.He sticked by his beliefs.
他坚持自己的信念。
4.She always holds to her convictions.
她始终坚持自己的信念。
5.He acted in accordance with his beliefs.
他按照自己的信念行事.
6.You have to stick up for what you believe in.
你应该坚信自己的信仰。
7.In conformity with one's beliefs, attitudes or abilities
按照自己的信念、态度或能力。
8.Hume believes his philosophy is human science.
休谟坚信自己的哲学是关于“人的科学”。
楼主以后有类似的疑问，可以直接打开网页
http://cb.kingsoft.com/，输入所要查询的字词，英文中文的都可以，就可以查到答案了！
授人以鱼不如授之以渔！~~
赠人玫瑰，手留余香！~
参考资料：http://dj.iciba.com/%E5%9D%9A%E4%BF%A1%E8%87%AA%E5%B7%B1%E7%9A%84%E4%BF%A1%E5%BF%B5/