How do we know something to be true? This question has preoccupied philosophy for as long as we can remember. Many answers are offered to solve the problem, but each one suffers from a different problem. For example, reason is a useful method of knowing, but reason only compares a claim with the axioms or assumptions; how do you know that your assumptions are indeed correct? Sense perception too doesn’t certify our assumptions because the same perception can be explained by alternative assumptions. This post offers an introspective view of knowledge under which what convinces us of the truth is not reason or perception, but the happiness that we experience as a consequence of that knowing. Under that happiness, all doubts are destroyed, and certainty is established.