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true believer

One who passionately supports a cause or concept. My sister is a true believer in social equality, so she is out at the protest today.
See also: believer, true

make a believer (out) of someone

to convince someone decisively about something. The game they played made a believer out of me; from now on, I'm betting on them. It was an interesting discussion, but it did not make a believer out of me.
See also: believer, make, of

be a great/firm believer in something

believe strongly that something is good, important or valuable: My mother was a great believer in horoscopes all her life.The boss was a firm believer in developing strong teamwork.
References in periodicals archive ?
Probably the Passion narratives were the first pieces to come together, because the most urgent thing for the first believers at the outset was to explain the death of Jesus--on whom they had been setting their hopes--and then fill this event out with stories of his teaching, preaching, and healing that led up to his death.
He does not, in turn, note that most greenhouse believers work in federally funded labs, or at federally backed research-center universities, where continued grant money is contingent in part on greenhouse alarm.
The believer must strive day and night to attain that powerful faith.
Councillor Ron Jones spoke on behalf of Eddie Francis, Mayor of Windsor, who also said he is a Believer.
The promise at the root of this joy is in the resurrection, which the believers share with Christ.
Abigail, a born-again believer of Christ, seeks to walk her journey holding the hand of Jesus so she may be pleasing to the Lord.
observes that in introductory courses on the OT, "the goals are to read texts in their original historical contexts and to determine as closely as possible the author's original intention and how the original audience would have understood the text" (167); the issue that then arises is how the biblical text can be seen as having significance today, how it can speak "religiously" to believers today after such an analysis.
Often, an audience of believers will agree with almost everything you say.
Their so-called extremist beliefs are nowhere near as solidified as those of the unwavering true believer and take second place to their emotional needs.
The mode of dipping or immersion was significant because it was symbolic of Christ's death, burial, and resurrection; but as important was the fact that baptism was the participatory act of a believer in the relational reality that was made possible by Christ.
At the National finals Daydream Believer finished third overall in the Elementary class, scoring 67.
In this way, all here are the same, whether rich or poor, educated or uneducated, Easterner or Westerner, believer or non-believer, and within believers whether Buddhist, Christian, Jewish, Muslim, and so on.
It is nearly impossible to become an Old Believer if you have not been one since birth.
While in the context of a theology of proclamation the exact perimeters and content of what it means to be a Jew or a Christian or (any believer for that matter) are always fluid, a Jew or a Christian's identity derives from her desire to proclaim God on the one hand and proclaim God in and through the language of her tradition as this develops and changes through history.