The Jewish People must have felt invincible after witnessing the greatest miracles in history—the Exodus and the splitting of the Red Sea.
It didn’t last long.
Three days after traversing the Red Sea, they reached Marah, and provisions ran low. No one could imagine the manna or well coming their way. They were thirsty; what were they going to drink?
וַיָּבֹאוּ מָרָתָה וְלֹא יָכְלוּ לִשְׁתֹּת מַיִם מִמָּרָה כִּי מָרִים הֵם עַל־כֵּן קָרָא־שְׁמָהּ מָרָה. וַיִּלֹּנוּ הָעָם עַל־מֹשֶׁה לֵּאמֹר מַה־נִּשְׁתֶּ – They came to Marah, but they could not drink the waters of Marah because they were bitter; that is why it was named Marah. And the people grumbled against Moshe, saying, “What shall we drink?” (15:23,24)
It was a legitimate survival question. The human body has physical limits.
They could have asked. Instead, they grumbled and complained.
As the Kotzker Rebbe profoundly teaches, it was not the waters that were bitter, but their hearts – כִּי מָרִים הֵם.
This teaching is not metaphorical; it is also supported by modern neuroscience. The concept of neuroplasticity explains that the brain physically reshapes its architecture to build new structures in response to whatever stimuli, behavior, and thoughts you’re pumping into it. Our experience of the world is shaped by our internal state; the world is a mirror that reflects back our states of consciousness.
As the Proverb teaches, as a man thinks in his heart, so he is – כִּי כְּמוֹ שָׁעַר בְּנַפְשׁוֹ כֶּן־הוּא (Proverbs 23:7). The thoughts we cultivate shape not only our self-perception but the world we encounter. A bitter heart sees a bitter world; a heart sweetened by gratitude and openness finds sweetness even in hardship.
We write our reality; life’s challenges often reflect the state of our inner world. Studies show that when people expect hostility, they interpret neutral actions as aggression. If you enter relationships or situations expecting hostility or failure, you’ll unconsciously act in ways that elicit those outcomes. The reverse is also true: projecting kindness often fosters positivity and connection.
Your mind is a filter, not a camera. Change the lens and the picture changes.
The stories you tell yourself, the emotions you cling to, and the patterns you repeat are the ingredients of your inner architecture. What are you feeding your mind? Is your mental, emotional, or spiritual diet cultivating thoughts of scarcity, resentment, and self-doubt, or are you nourishing yourself with hope, curiosity, and compassion?
Our minds filter reality based on what we expect to see. If we train our minds to expect bitterness, we will find it—even in places where sweetness exists. When you see the world as unkind, consider whether you are viewing it through the lens of your own dissatisfaction.
You don’t see the world as it is; you see it as you are. When you change the way you look at things, the things you look at change.
Small, positive changes in thought patterns lead to profound shifts over time. Modern psychological theories, such as confirmation bias, affirm that we notice what aligns with our beliefs. We can intentionally harness this mechanism to rewire our neural pathways with gratitude and openness.
You are not just an observer; you are the builder.
This world has always contained both bitterness and sweetness, but we choose the lens through which we see it. If the reflection feels bitter, try softening your gaze. Sweeten your perception, and you may taste a world that has been waiting for you to taste its sweetness.