(From Sanhedrin 107a)
Rava illuminates the root of Dovid’s attraction to Bathsheva:
Rava expounded: What is the meaning of that which is written: For I was suited for the rib, but my pain is always before me? Bathsheva the daughter of Eilam was suited since the Six Days of Creation to be the wife of Dovid, but she came to him in pain, i.e. scandal. And this was also taught in a Baraisa of the academy of Rabbi Yishmael: Bathsheva the daughter of Eilam was suited to be the wife of Dovid; he merely took her before the time was ripe.
The Gemara (Avoda Zara 5a) states that Dovid was not fitting of his action with Bathsheva, and he did what he did to instruct future generations regarding repentance. The Gemara adds that the Jewish People also were not fitting in their fashioning the Golden Calf, but they did what they did to instruct future generations regarding repentance. The common denominator between the fashioning of the Golden Calf and the action of Dovid was a lack of restraint. The Jewish People would not wait until Moshe returned from heaven, and Dovid did not wait until the pre-ordained time for his marriage to Bathsheva.
There are many situations in ones life where exercising restraint is the proper way to proceed, but one cannot help himself. The Arzial writes that had Adam Harishon waited until Shabbos to eat from the Tree of Knowledge of Good and Bad, the world would have reached a state of perfection. One who exhibits patience is not merely considered virtuous, but is regarded as one who perfects the world. Let us learn from our forebears to restrain ourselves concerning matters where the fate of future generations hangs in the balance.
Daf Drush 