How To Be A Talmid Of Bilaam

 כָּל מִי שֶׁיֵּשׁ בְּיָדוֹ שְׁלשָׁה דְבָרִים הַלָּלוּ, מִתַּלְמִידָיו שֶׁל אַבְרָהָם אָבִינוּ. וּשְׁלשָׁה דְבָרִים אֲחֵרִים, מִתַּלְמִידָיו שֶׁל בִּלְעָם הָרָשָׁע. עַיִן טוֹבָה, וְרוּחַ נְמוּכָה, וְנֶפֶשׁ שְׁפָלָה, מִתַּלְמִידָיו שֶׁל אַבְרָהָם אָבִינוּ. עַיִן רָעָה, וְרוּחַ גְּבוֹהָה, וְנֶפֶשׁ רְחָבָה, מִתַּלְמִידָיו שֶׁל בִּלְעָם הָרָשָׁע. מַה בֵּין תַּלְמִידָיו שֶׁל אַבְרָהָם אָבִינוּ לְתַלְמִידָיו שֶׁל בִּלְעָם הָרָשָׁע. תַּלְמִידָיו שֶׁל אַבְרָהָם אָבִינוּ, אוֹכְלִין בָּעוֹלָם הַזֶּה וְנוֹחֲלִין בָּעוֹלָם הַבָּא, שֶׁנֶּאֱמַר (משלי ח) לְהַנְחִיל אֹהֲבַי יֵשׁ, וְאֹצְרֹתֵיהֶם אֲמַלֵּא. אֲבָל תַּלְמִידָיו שֶׁל בִּלְעָם הָרָשָׁע יוֹרְשִׁין גֵּיהִנֹּם וְיוֹרְדִין לִבְאֵר שַׁחַת, שֶׁנֶּאֱמַר (תהלים נה) וְאַתָּה אֱלֹהִים תּוֹרִידֵם לִבְאֵר שַׁחַת, אַנְשֵׁי דָמִים וּמִרְמָה לֹא יֶחֱצוּ יְמֵיהֶם, וַאֲנִי אֶבְטַח בָּךְ:

Whoever possesses these three things, he is of the disciples of Avraham, our father; and [whoever possesses] three other things, he is of the disciples of Bilaam, the wicked. A good eye, a humble spirit and a moderate appetite he is of the disciples of Avraham, our father. An evil eye, a haughty spirit and a limitless appetite he is of the disciples of Bilaam, the wicked. What is the difference between the disciples of Abraham, our father, and the disciples of Bilaam, the wicked? The disciples of Avraham, our father, enjoy this world, and inherit the world to come, as it is said: “I will endow those who love me with substance, I will fill their treasuries” (Proverbs 8:21). But the disciples of Bilaam, the wicked, inherit Gehinnom, and descend into the nethermost pit, as it is said: “For you, O God, will bring them down to the nethermost pit those murderous and treacherous men; they shall not live out half their days; but I trust in You” (Psalms 55:24).

A MIND BLOWING Rambam in the Peirush Hamishnayos. He says that Bilaam's Ayin Ra'a was חריצות על הממון - he was very diligent about money. He wrote the commentary in Arabic so I don't know what exact word he used in Arabic but the idea is understood. He was "into" money. If one is "into money" he has a Rebbe. His Rebbe is "Ha-Admor Bilaam". He might have a black hat and a beard but if he goes even a little bit overboard in his quest for money he is a Talmid of Bilaam. 

There is loads and loads of more Mussar to learn from this Mishna - ועוד חזון למועד בעז"ה בל"נ.