Gemara:


Ein Ayah:
Waiting is needed to align the nature of the heart according to the intellect. There are several differences between one who enabled his mind to have an effect on his heart’s nature and one who just used his mind to force himself to act in the proper way. The main one is in regard to regularity.
Once one has raised his nature in line with his intellect, he will not lose righteousness as "Hashem guards the legs of his righteous" (Shmuel I, 2:9). However, as long as one’s nature remains wild, even if at a certain time he is elevated to lofty levels, he can be expected to fall back. That’s why proper prayer should be done in a manner of "sitting in Hashem’s house." The waiting brings one to a position of permanence in the way of the righteous, upon which it says "They will still praise You sela (forever)" (Tehillim 84:5), which hints at an uninterrupted manner.