In Parashas Shemos, we read:
And the angel of the L-rd appeared to him in a flame of fire out of the midst of a bush: and he looked, and, behold, the bush burned with fire, but the bush was not consumed. And Moshe said, I will now turn aside, and see this great sight, why the bush is not burnt. And when the L-rd saw that he turned aside to see, G-d called to him out of the midst of the bush, and said, Moshe, Moshe. And he said, Here I am.
I was thinking of something familiair. In Sefer Shmuel, we read that G-d tries to call Shmuel, but Shmuel did not know of G-d yet, neither was His word revealed to him. Only after the fourth time, Shmuel knew it was G-d who was calling him, and not Eli.
So this got me thinking.
Besides the fact that the angel of the L-rd appeared to Moshe, how did Moshe know who was calling him? When G-d calls him twice (v.4), Moshe immediately responds with:
וַיֹּ֥אמֶר הִנֵּֽנִי And he said: Here I am
What was different here, in comparison to when G-d tried to call Shmuel, but Shmuel did not know that it was G-d calling him?
--------------------------------- My own thoughts, that might help----------
Maybe the main difference is that Moshe Rabbeinu was interested into the fact that the bush was burning. He knew that there was some greater power doing that, and wanted to find out why. As the Sforno explains, the principle of הבא לטהר מסיין אותו applies here. So, you would say this would set apart Moshe Rabbeinu in that sense from Shmuel. However, The Shelah says that when Hannah says: זרע אנשים, it means that that she asked for a son who would combine within himself the virtues of Moshe and Aharon. In Tehillim 99:6, Moshe and Aharon are compared to Shmuel.
The Shelah goes on to say that Moses in his closeness to G–d had concentrated almost exclusively on devoting himself to G–d. Aharon, on the other hand, concentrated on the virtue of "peace." He was always busy pursuing peace, trying to restore harmonious relations between husband and wife, etc. So what about Shmuel? The Shelah says: The prophet Samuel concentrated on practising the two outstanding virtues of both Moshe and Aharon. - so, according to this explanation, Shmuel possesed virtues of both Moshe and Aharon. This makes it difficult for me to understand why Shmuel was not able to recognise that it was G-d calling him, but Moshe Rabbeinu was able to do that right away.