The worst prison is when G‑d locks you up. He doesn't need guards or cells or stone walls. He simply decides that, at this point in life, although you have talent, you will not find a way to express it. Although you have wisdom, there is nobody who will listen. Although you have a soul, there is nowhere for it to shine.

And you scream, "Is this why you sent a soul into this world? For such futility?"

That is when He gets the tastiest essence of your juice squeezed out from you.

Frustration, like the first tzimtzum, is the great juicer of all creativity.

Likutei Sichot vol. 23, pp. 163–165; Shlach 5732:1; 5th night of Chanukah 5720:4.