“We are what we think. All that we are arises with our thoughts. With our thoughts we make the world.”
The Buddha

More about thought:
“We are addicted to our thoughts. We cannot change anything if we cannot change our thinking.”
~ Santos Kalwar, Quote Me Everyday
The soul becomes dyed with the color of its thoughts.”
~ Marcus Aurelius, Meditations
“Closed in a room, my imagination becomes the universe, and the rest of the world is missing out.”
~ Criss Jami, Diotima, Battery, Electric Personality
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Think /THiNGk/
verb
1 – have a particular opinion, belief, or idea about someone or something. “she thought that nothing would be the same again”
2 – direct one’s mind toward someone or something; use one’s mind actively to form connected ideas. “he was thinking about Colin”
noun (informal)
an act of thinking. “I went for a walk to have a think”