It is generally accepted that the three conditions for us to possess knowledge is justified, true, belief. The first condition is belief. We cannot know unless we believe, even if it is true and we have great reasons to think it is true, we will only know it if we believe it. The second condition is truth. No matter how justified a belief, or how long it is believed, it cannot constitute knowledge if it turns out false. The third condition is justification. Lucky guesses don’t count, we can only know if we have a really good reason to believe.
The Tripartite Theory states; subject (s) knows proposition (p) if and only if (i) p is true, (ii) s believes that p and (iii) s’s belief that p is justified.
So in order to have propositional knowledge it actually has to be true, we need to believe it is true and our reasons need to be justified.
For example, as I write this essay I (s) know that its 20degrees outside (p). First of all, it is true, it is 20 degrees outside (i). I believe it is true (ii) and I am justified in my belief because I can see the temperature gauge outside showing 20 degrees, the radio weather channel mentioned it is 20 degrees outside today and it just feels like 20 degrees outside to me (iii). Due to the Tripartite Theory,