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The transliteration for poor in the Greek is ‘ptochos’ or pauper.
We know the kingdom of heaven is now which means the poor in spirit can be filled while here with the Lord’s supplication of His love and direction.
Brigham’s comment seen below reveals he didn’t care about truth.
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Journal of Discourses; 10:299 “Jesus had no other meaning than simply, blessed are they who have the light of revelation to understand the providences of God, and to know Him and themselves.” – Brigham Young, Salt Lake City, June 4, 1864