This goes against the grain of rational thought and logic. We Jews agreed to what G-d wanted us to do before we knew what it involved. We signed the contract with G-d before we knew what the terms of the contract were.
This is why G-d chose us as HIS chosen people. We were willing to what G-d wanted us to do and be before G-d told us what it involved.
“After concluding its account of how G‑d taught Moses the Torah’s laws on Mount Sinai, the narrative returns to its account of the Giving of the Torah. This time, it focuses on the covenant that G‑d forged between Himself and the Jewish people by giving them the Torah. The day before the Giving of the Torah, Moses informed the people that receiving the Torah would involve both studying it and performing G‑d’s commandments..
[The people] responded, “We will do and we will learn everything that G‑d has spoken.” Exodus 24:7
By saying “we will do” before “we will learn,” the Jewish people declared that they were prepared to fulfill G‑d’s will unconditionally – accepting His commandments even before they knew what they were. It is still on the condition of this commitment that G‑d continues to “give us the Torah” today – i.e., revealing Himself and His will to us as we study the Torah and perform its commandments.
Conventional thinking may deem it irrational to commit oneself to a contract before the terms of the contract are spelled out. And we can indeed connect to G‑d as He reveals Himself within creation without first committing ourselves to do whatever He wants. But the only way we can connect to G‑d Himself – i.e., as He is beyond creation and rationality – is by likewise rising above the limits of rationality. Therefore, nowadays, just as when the Torah was first given, the way we connect with G‑d Himself is by devoting ourselves to His Torah unconditionally.1 Likutei Sichot, vol. 23, p. 92 ff; Sichot Kodesh 5739, vol. 3, pp. 295–297; Igrot Kodesh, vol. 7, p. 28; Hitva’aduyot 5748, vol. 3 pp. 234–235; Sichot Kodesh 5741, vol. 4, pp. 31–32.