Honoring parents – commonsense vs mitzva

Netziv(Approbation to Ahavas Chesed): ….It says in Yevamos (79a): There are three inherent characteristics of the Jewish people – they are merciful, shy and they do acts of kindness to others. … Nevertheless there are explicit commands in the Torah to do acts of kindness such as Vayikra (25:35): You shall support your brother who has become poor, Shemos (22:24): Do not lend money with interest. The reason for this is to teach us that besides being obligated to do acts of kindness because we are human beings we have an addition obligation from the Torah – just as we have for all the mitzvos which we wouldn’t know from commonsense. The consequences of having both an inherent commonsense obligation as being part of mankind as well as an explicit command in the Torah is illustrated by the obligation to honor parents. The Torah command teaches that even though there is a command from commonsense that all of mankind is obligated to keep and receives reward for do it, nevertheless G‑d has in addition explicitly commanded us to do it as an aspect of the Torah (Shemos 20:11)… As a Torah mitzva honoring parents is a statute which must be done simply because it was commanded and not because it makes sense. For example if a non‑Jew fathers a child with a Jewish woman, than according to the Torah that child has a mother but no father. Therefore there is a greater obligation of honoring the mother than the father because the honor of the mother is dictated by not only commonsense but also from the Torah. …There are also consequences for lending money to a needy person. Even though it is clearly a commonsense obligation but it is also governed by Torah law. In this case the obligation from commonsense is inconsistent with the obligation of the Torah. The contradiction occurs in regard to charging interest. For example, in the case of a person whose life depends upon lending money with reasonable interest. From the commonsense point of view he still performs a great mitzva of lending money – even with interest – to sustain another person who desperately needs the loan. However the Torah specifically prohibits charging interest. Therefore according to the Torah a Jew would not be able to lend the money and thus he is prohibited from doing the kindness to the other person as well as sustaining himself. [This was explained in Harchev Davar - Bereishis 48:19 – concerning the Tabernacle at Shiloh…]