(2) ’Thus speaketh the LORD of hosts, saying: This people say: The time is not come, the time that the LORD’S house should be built.’ (3) Then came the word of the LORD by Haggai the prophet, saying: (4) ’Is it a time for you yourselves to dwell in your cieled houses, while this house lieth waste? (5) Now therefore thus saith the LORD of hosts: Consider your ways.
At the end of galut bavel, bnei yisrael return to their land but fail to rebuild the beit hamikdash. Chagai, a prophet, receives the word of G-d on the subject: Should we be living in new, furnished houses while Hashem's house lies barren?
Nowadays, we don't have nevi'im to give us this message. However, our situation is better than in the days of Chagai. We have complete political independence in Israel, and we dwell securely in beautiful communities. Kal va'chomer, it's the time to build the beit hamikdash.
Notice who's doing the building. Yeshua ben Yotzadak, one of the names mentioned here, is the kohen gadol, and kohanim were the ones who taught torah in the times of the mikdash. If the head of all Jewish education stopped teaching to build the beit hemikdash, than surely we should follow his lead.
This sheet is so short because ther is very little to argue.