Ramban

"שְׁמַע בְּנִי מוּסַר אָבִיךָ, וְאַל תִּטֹּשׁ תּוֹרַת אִמֶּךָ תִּתְנַהֵג תָּמִיד לְדַבֵּר כָּל דְּבָרֶיךָ בְּנַחַת, לְכָל אָדָם וּבְכָל עֵת, וּבַזֶּה תִּנָּצֵל מִן הַכַּעַס, שֶׁהִיא מִדָּה רָעָה לְהַחְטִיא בְּנֵי אָדָם... וְכַאֲשֶׁר תִּנָּצֵל מִן הַכַּעַס, תַּעֲלֶה עַל לִבְּךָ מִדַּת הָעֲנָוָה, שֶׁהִיא מִדָּה טוֹבָה מִכָּל מִדּוֹת טוֹבוֹת ... לְמַעַן תַּצְלִיחַ בְּכָל דְּרָכֶיךָ, וְתִזְכֶּה לָעוֹלָם הַבָּא הַצָּפוּן לַצַּדִּיקִים."

"Therefore, I will now explain to you how to always behave humbly. Speak gently at all times, with your head bowed, your eyes looking down to the ground and your heart focusing on Hashem. Don't look at the face of the person to whom you are speaking. Consider everyone as greater than yourself. If he is wise or rich, you should give him respect. If he is poor and you are richer -- or wiser -- than he, consider yourself to be more guilty than he, and that he is more worthy than you, since when he sins it is through error, while yours is deliberate and you should know better!"

"Erring, I wandered in the wilderness, In passion's grave nigh sinking, powerless; Now deeply I repent, in sore distress, That I kept not the statutes of the King!"

"כל התורה כולה שמותיו של הקב״ה"