Мусар к Тегилим 84:6

And after all this, he must cast his burden on G-d. For then, it will be said of him: "fortunate is the man whose strength is in You... G-d will not withhold good from those who walk perfectly (b'tamim)"(Tehilim 84:6-12).

That which will help greatly in acquiring Chasidut is great observation and much contemplation. For when a person contemplates much on G-d's great exaltedness, blessed be He, and His absolute perfection, and the immeasurably great distance between His greatness and our lowliness, he will be filled with fear and trembling before Him.