Think! It Will Happen!

Hashem says about the plan of the migdal baval, וְעַתָּה֙ לֹֽא־יִבָּצֵ֣ר מֵהֶ֔ם כֹּ֛ל אֲשֶׁ֥ר יָזְמ֖וּ לַֽעֲשֽׂוֹת and therefore he mixed up the languages.  Why can't  Hashem just stop their plan? 

Rashi in Shoftim (19:19) says כאשר זמם – ולא כאשר עשה, the adim zommimim only get punished if their plan was not fulfilled but not if there testimony was carried out.  Everyone asks this is counterintuitive?  The Maharal explains that a thought a person has must come to fruition.  If their plan was not carried out, then it boomerangs back on their head and that is why they get punished.  It is their own plan that strikes back at them.  The Mictav explains that the source for this power of a person's thought is because man was created to be like G-d.  Just as G-d's "thoughts" have an effect, so too the plans of mankind.  Based upon this, says the Sifsay Chayim, that is the peshat in the possuk here.  Since the entire world had one plan, they were aligned in thought, the plan would have to bring forth the migdal and hence Hashem had to split the languages. 

The Zohar (76b) says חָמֵי מַה כְּתִיב הֶן עַם אֶחָד וְשָׂפָה אַחַת לְכֻלָּם. בְּגִין דְּאִנּוּן בְּלִבָּא חַד וּרְעוּתָא חַד וּמְמַלְּלֵי בִּלְשׁוֹן הַקֹּדֶשׁ. וְעַתָּה לא יִבָּצֵר מֵהֶם כָּל אֲשֶׁר יָזְמוּ לַעֲשׂוֹת. וְלֵית מַאן דְּיִמְנַע עוֹבָדָא דִלְהוֹן. אֲבָל מַאי אַעֲבִיד, אֲבַלְבֵּל לוֹן דַּרְגִּין דִלְעֵילָא, וְלִישַׁן דִּלְהוֹן לְתַתָּא. וּכְדֵין אִתְמְנַע עוֹבָדָא דִלְהוֹן. וּמַה בְּגִין דְּהֲווּ בִּרְעוּתָא וְלִבָּא חַד וּמְמַלְּלֵי בִּלְשׁוֹן הַקֹּדֶשׁ כְּתִיב לֹא יִבָּצֵר מֵהֶם כֹּל אֲשֶׁר יָזְמוּ לַעֲשׂוֹת, וְדִינָא דִלְעֵילָא לָא יָכִיל לְשַׁלְטָאָה בְּהוּ. אֲנַן אוֹ חַבְרַיָיא דְּמִתְעַסְּקִין בְּאוֹרַיְיתָא, וְאֲנַן בְּלִבָּא חַד וּרְעוּתָא חַד, עַל אַחַת כַּמָּה וְכַמָּה.  We, the people that remain with lashon hakodesh, if we are determined to gather to accomplish something for the good it will for sure happen (see Sfas Emes 5635.)  The Sifsay Chayim brings from the Punarvichar Rav in the name of the Chofetz Chayim that really our plans and dreams should take root, the reason why they do not is only because we don't really have a serious strong desire for things, there is always a maybe not, maybe something else etc.  However, if a person would strongly desire something it would take effect.  That is what it means אין דבר עומד בפני הרצון.  Your desire will make it happen.