vrttayah pancatayyah klistaklistahYoga Sutras of Patanjali, 1.5
वृत्तयः पञ्चतय्यः क्लिष्टाक्लिष्टाः
There are five kinds of thought waves, some bring suffering and some don’t
vrttayah = whirlpools, waves (thoughts)
pancatayyah = 5 kinds
klistaklistah = suffering and not suffering
Think this one is placing thoughts into 5 states (they will be named in the following sutras) and saying that some of them bring suffering and some of them don’t.
I tried to draw thoughts as a metaphor with how the sea is at different times, sometimes completely calm, sometimes gentle waves, sometimes big waves, sometimes violent and stormy and sometimes a tsunami.
It doesn’t really matter what state the sea is in and won’t affect you too much if you are a bird flying above it or a fish deep down. In the same way if you observe your thoughts or meditate you can stop being reactive, get out of negative thinking and not get carried away by obsessive thoughts.