Musar su Esodo 20:15

I have also come to awaken ourselves to another thing that most men stumble in. It is well known that [the issur of] theft obtains both with others and with relatives, and even with one's father and mother, as we find in Bava Kamma 70a: "If one stole from his father, etc." And it is obvious that the negative commandment of "You shall not covet" also obtains with all. And see Choshen Mishpat that the negative commandment of "You shall not covet" does not obtain with desiring in the heart alone, but with one's being so profuse in blandishments of another that he finally consents to give him what he wants. Accordingly, if one joined another in a wedding agreement [tenaim] to wed his daughter to his son and they agreed what each would give [(For before they reach an agreement, each is entitled to ask whatever he wishes, stating that lacking this, he does not wish to sign)], and after this he heaped blandishments upon the other to extract more and more, apparently the negative commandment of "You shall not covet" obtains, and this with all such optional gifts [(as opposed to grants of charity)], where the other does not really wish to give but consents only under the pressure of the blandishments.

וירא העם וינועו ויעמדו מרחוק. Rashi on 20,15 says that this means that the people trembled. If someone wishes to merit the crown of Torah he must relate to Torah as did the Israelites at that time, i.e. he must study with a feeling of awe and reverence; he must not consider Torah study as a pleasurable experience. He must study diligently and sanctify himself from the impurity contracted through seminal emissions. His hands should be clean before he sits down to study Torah.