Or HaChaim on Numbers 22:6/אור החיים על במדבר כ״ב:ו׳

1 ועתה לכה נא, "and now please come, etc." Balak used the word ועתה, "and now," to indicate that he did not want Bileam to delay before he would come as he felt himself in danger every moment. He pleaded by using the word נא, "please," adding that Bileam should curse this people לי, "for me." By this he meant that the effectiveness of Bileam's curse should not be delayed until after the Israelites had a chance to revenge themselves on him and Moav for having called in Bileam to curse them. By using the word לי, Balak also hinted that although -according to the Midrash- Bileam had already blessed Balak personally so that he had no reason to fear the Israelites himself, he wanted the Israelites cursed and was not content with being blessed. In the event Bileam were to say that there was no need for this, Balak added כי עצום הוא ממני, "for it is more mighty than I." Balak had two things in mind when he said these words. 1) Israel's natural strength; 2) the matter of the blessing. He felt that Israel had received more powerful blessings than he had received from Bileam. When he went on אולי נכה בו, "perhaps we can smite it," he meant that even after Bileam would do all that he requested him to do he would still not feel confident to take on the Israelites by himself. At best, he might be able to inflict a defeat on them, certainly not to wipe them out. He might also have drawn a line between the righteous Israelites and the average ones. Of the former he expressed the hope that he could expel them from the region, ואגרשנו מן הארץ, whereas concerning the less pious Israelites he entertained hopes of defeating them, נכה בו.

2There is also a moral/ethical message in Balak's words. His words boomeranged upon himself. When he said ארה לי, "curse for me," this turned out to be "curse me." Had he not used these words his daughter Kosbi would not have been killed by Pinchas. Bileam's coming to Moav and failing to curse the Israelites also became the reason that Balak was forced to return to Midian and be killed by the sword during the punitive expedition involving 12.000 Israelites as described in 31,8. If Bileam had not travelled all the way to Moav and assured these people that they were safe from the Israelites until the distant future, Balak would have remained on the throne in Moav, secure from all the wars the Israelites would be involved in. As it was, he became the personification of Psalms 37,15: "their swords shall pierce their own hearts."

3כי ידעתי את אשר תברך מברך, "for I know that if you bless someone, etc." We may understand this as a reference to another statement in the Midrash we quoted earlier that Bileam had foretold Balak that he would become a king. Balak acknowledged that Bileam's blessing had indeed come true for him. This was something only he was aware of as he had experienced it personally. On the other hand, it was common knowledge that Bileam's curse was effective for when Sichon went to war against Moav he had hired Bileam to curse Moav (compare Tanchuma on this paragraph). As a result, Sichon had captured large parts of Moav. [land which the Israelites had now captured from Sichon. Ed.] We have to mention here that the reason Bileam's curses had seemed effective to people who hired him was 1) he possessed the power of the evil eye; 2) he knew when to exploit the precise moment when G'd was angry and he chose that moment to utter his curse. (compare Berachot 7). He did not have parallel powers to make his blessings effective for any length of time.

4As a matter of fact, a blessing by Bileam was about as effective as a blessing by a donkey. Bileam merely pretended to bless after he had observed that the horoscope of the person in question fore-shadowed that he would be successful. All Bileam did was to match his blessing to what he foresaw in that person's horoscope. When the blessing appeared to have been fulfilled, Bileam claimed credit for it as if he had been the cause and not horoscopic forces. This was precisely how he came to bless Balak and predicted that he would become king. He had consulted Balak's horoscope and found that it foretold that Balak would become a king. He had deceived Balak by letting him believe that he, Bileam, had been the cause of his becoming king.