Give it a listen. Here’s another version. An here’s an English version with alternative lyrics by Pete Seeger.
Thoughts are free, who can guess them?
They flee by like nocturnal shadows.
No man can know them, no hunter can shoot them
with powder and lead: Thoughts are free!
I think what I want, and what delights me,
still always reticent, and as it is suitable.
My wish and desire, no one can deny me
and so it will always be: Thoughts are free!
And if I am thrown into the darkest dungeon,
all this would be futile work,
because my thoughts tear all gates
and walls apart: Thoughts are free!
So I will renounce my sorrows forever,
and never again will torture myself with whimsies.
In one’s heart, one can always laugh and joke
and think at the same time: Thoughts are free!