Musar do Rodzaju 7:1

'ויאמר ה' לנח בא אתה וגו. We learn from here that a guest does not have the right to enter his host's home unless invited to do so. Even Noach did not want to enter the ark until G–d the owner asked him to. Only then does the Torah report that Noach entered the ark.

כי אותך ראיתי צדיק. This teaches that one should not entertain a guest unless one had satisfied oneself that such a guest is a person of good name. We also learn from this short paragraph that a guest is not entitled to bring other guests with him without the host having expressed his consent. Noach needed special permission from G–d to bring along his family into the ark (Genesis 7,1).

We have explained in our commentary on בראשית, that the letter מ is an allusion to the מלאך המות, angel of death. Keeping this in mind, one may view the moral challenge of the ark i.e. מגדל, to Noach: the hope that he should be man enough when descending from the “מ” of that מגדול to become גדול, morally equivalent to what the last letter in that word גדול represents, and to thereby be able to overcome the power of the angel of death. In other words, he should fulfil the promise inherent in נח איש צדיק תמים, to be not only righteous but "perfect." The ark would then have become equivalent to the ultimate Temple, the מגדל עז, whose glory will outshine that of the previous Temples. He, Noach, would have been the צדיק that is described in Proverbs 18,10 as being elevated.