Why do we Mourn for the Temple Nowadays?

«The reason we fast in mourning over the destruction of the Temple, even though it is [in the] past, is to become aware we presently have faults similar to those which caused the destruction, and we should work on improving ourselves.»

R Zelig Pliskin -
Gateway to Happiness p. 148

Quoting -
Taamei Haminhagim, p. 295


Best Regards,
RRW