both are grammatically correct but neither sounds very natural. here are some ways that a native speaker might say it: -Education is the pathway to a better life. -Education opens up doors in life. -Education helps ensure a good quality of life. why did I change the word ´knowledge´ to education? Because education the process of learning (التعلّم). Knowledge is what you acquire when you learn (المعرفة). So when you are talking about ´pathways to a better life,´ I think it makes a little more sense to say that *getting* knowledge is the pathway, instead of knowledge itself being the pathway. But again, your sentences were good, I am just trying to help you sound as much like a native speaker as possible. Sorry if this sounds very صارم hhh :D

Indeed they're correct