Every Friday night, at the start of the Shabbos meal, Jews have the custom to sing the song אשת חיל, or "Woman of Valor," an excerpt from Proverbs written by King Solomon praising the Jewish Woman. The custom may be in part to praise the woman of the house for preparing the Shabbos table, but we still sing it even if there were no women involved. What are we singing about if it is not the woman of the house?
The answer is the Torah is also called an אשה, a woman or a wife. The Gemara in Kudishin (30a) learns that the use of this word for "wife" in a verse in Kohelet (also by King Solomon) refers either to the obligation to teach one's son Torah, or to help him get married. (ראה חיים עם האשה אשר אהבתה, קהלת ט,ט).
In a certain respect, Torah is a wife. Just like a wife brings out a man's full expression in the physical world by bearing children, Torah also is essential in bringing a person out into the world.
Following this line of thought, the Vilna Gaon explains the verse in בטח בה לב בעלה" ;אשת חיל" (Her husband's heart trusts in her). He says it refers to trusting in the Torah that it will straighten a person's "מידות" (Middos) or character traits. Middos are much more than habits, or even temperament, they are the way a person expresses himself in this world, and they are essential in bringing out his hidden potential. Even Hashem has Middos. We can't conceive of what Hashem is in his essence - that is entirely beyond us. All we have is how he chooses to reveal himself to us through certain modes of expression. Similarly with people, although our essence is not entirely beyond understanding, the only way we know each other is through the way we express our selves in the world, and that depends on Middos.
But character traits are very complex and deep. Even a person who is conscientious and hardworking will find it beyond his reach to truly understand the psychological and spiritual underpinnings of his character and perfect them to allow a genuine and full expression of himself. Who knows if I am only going this way because of my biases, or maybe I'm missing something? Says the Vilna Gaon, that's what King Solomon's praise of the Torah is about. If a person is dedicated to learning and living by the Torah, he does not have to completely understand himself to know he is moving in the right direction. He can rest assured that his efforts will not go in vain because the Torah encompasses the whole spectrum of Middos in the original perfection and order with which Hashem created the world. So long as he is vigilant, the process will take him where he needs to go in actualizing his potential and bringing himself out. The man who makes the Torah as his "wife" experiences that security in his heart.