GbEng
我深信每个人都是靠出卖什么东西生活的。 I am convinced(that) everyone lives by selling something.
我深信自满情绪是我们各种问题的根源. It's my conviction (ie I firmly believe) that complacency is at the root of our troubles.
我对他的诚实深信不疑。 I am convinced of his honesty.
信念对真理、事实或某物的正确性在思想上接受或深信不疑 Mental acceptance of and conviction in the truth, actuality, or validity of something.