sparklecat said:
John 18:20 "I have spoken openly to the world," Jesus replied. "I always taught in synagogues or at the temple, where all the Jews come together. I said nothing in secret."
False. Jesus taught in boats, on mounts, to his disciples in private, etc.
Jesus offers this reply after "The high priest ... asked Jesus concerning his disciples, and concerning his doctrine" (John 18:19). Unfortunately, the precise content and phrasing of the questions to which John 18:20 is intended to respond isn't given in the account, which makes it somewhat difficult to conclude that Jesus' answer is inappropriate or (worse) false. If he was asked about, say, particular doctrines he taught in his public ministry (including in synagogues and the temple) his response might then reasonably be construed to mean "I've taught that publicly, and I've never said anything 'off the record' to contradict such teaching."
In addition, the Greek word
sunagoge rendered as "synagogue" in English, apparently means "gathering", and seems to have been used rather flexibly in the New Testament (including uses of its cognate verb to mean simply "to gather"). Interestingly, the unabridged
Oxford English Dictionary indicates that the term "synagogue" had a now-obsolete sense in English meaning simply "a gathering or assembly" - regardless of composition, location or purpose - and cites examples of this usage in texts from the 14th through the 19th centuries.
Particularly when one considers that
sunagoge or its cognates are used elsewhere in the New Testament to indicate informal assemblies of various sizes and in various contexts (including what one would normally consider "private" gatherings of the disciples, as in Acts 4:31), it seems probable that
sunagoge is flexible enough to apply to teachings imparted directly to the Twelve, or sermons on mounts, and perhaps even teachings aboard boats.
Accordingly, in light of all of the foregoing, I'm inclined to view the "Jesus lied!" interpretation of John 18:20 as rather strained and weak, although perhaps I wouldn't dismiss it entirely.