From OUTREACH MAGAZINE:
In light of the many revelations of respected Christians who were, in truth, leading deeply entrenched shadow lives, the “fruit test” has loomed large.
And what is that test?
In speaking of false prophets, Jesus said that we will be able to recognize them by their fruit. Good trees, He maintained, produce good fruit, and bad trees produce bad fruit. A bad tree cannot produce good fruit (Matthew 7:15-20). From this has come a popular litmus test: If an individual’s ministry effort is bearing good fruit, they must be good. The “fruit” of their ministry clearly validates them as individuals. More Here