On pages 27 & 28 of the August 2019 Study Watchtower, it perverts the translation of scriptures yet again, in order to drum it into JW's minds that they have to work for their salvation. It says this:
“On the evening before his death, Jesus told his disciples: “Exercise faith in God; exercise faith also in me.” (John 14:1)
According to Strong's Lexicon, the Greek word pisteuō is translated thus - “to think to be true, to be persuaded of, to credit, place confidence in, of the thing believed, to credit, have confidence.”
These renderings point to a mental acceptance and belief - something which was not felt previously.
It had nothing to with “exercising faith” in something/someone.