English version

be a (great/firm) believer in something

From Longman Dictionary of Contemporary Englishbe a (great/firm) believer in somethingbe a (great/firm) believer in somethingAPPROVEto believe strongly that something is good and effective I’m a great believer in regular exercise. believer
Examples from the Corpus
be a (great/firm) believer in somethingDaley was a firm believer in the bootstrap theory.He was a firm believer in the power of prayer.He was a great believer in expressing aggression, not bottling it up.Lampard was a great believer in eating whenever you could.Letterman is a believer in the immigrant mentality.Molly was a believer in homeopathy and underwent her last operation and subsequent treatment in the Royal London Homeopathic Hospital.She is a believer in fundamentals, in technique.Tip is a firm believer in fate, and in 1961 the finger pointed in the right direction for him.
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