Understanding Builds the Beis HaMikdash
The Chida explains why a person with true understanding is considered to have rebuilt the Beis HaMikdash in his own day.
The Gemara says that whoever has understanding is regarded as though the Beis HaMikdash was built in his days. The Chida asks what understanding has to do with it, and answers that a person with real da'as recognizes his own shortcomings, his nature and his obligation to serve Hashem. Seeing himself honestly, his humility grows. A truly humble person brings, in a sense, every offering at once, and so it is as if the Mikdash itself stood in his days. In another place the Chida adds that understanding is a gift from Hashem, given as an act of grace, and that it must be used only for His service and never for cleverness in sin. Knowledge, rightly used, leads us to humility, and humility brings Hashem's presence into the world.
Source: Devash LeFi, Letter Dalet:8 (see also Letter Dalet:6)
When you learn something new today, a halacha, a passage of Torah or even a skill, ask yourself what it shows you about where you still need to grow. Let the answer make you smaller in your own eyes, and more eager to serve. If you catch yourself using what you know to look good, stop and use it for someone else instead. A little real humility does more for the world than a great deal of cleverness.