"thorn and spikes you shall grow" meaning- without work- it will only grow thorns that is not the world's natural state, this only came after the sin of adam and if you want bread, a livelihood- "with the sweat of your brow you will eat bread" you need to work the land- put in effort, labor- so there's a curse- what can we do? after we were cursed- man had to put in his efforts in the matters of livelihood but not to exaggerate so much by looking for wealth etc. we must work in order to be sustained in a balanced way and trust g-d that if he wants to make me wealthy, he has his ways of turning me into a rich man