It can be as basic as the search for meaning indicates that there is meaning, a proof. Otherwise, where would you get that idea? Random? Imaginary? It's not even possible in the backdrop of not being able to explain something coming from nothing. I've come to the realization the last few years that it's very clear that logically "God" exists/is real/is who He is, etc. The particularities of that and what convinces some people various things about God, history, revelation, etc are a long discussion, of course. As are any in fields of study in discerning truth, mastery, skill.
Clive Staples Lewis said, straight and to the point, that if the Sun exists (let's call it the origin of light and its metaphors), it has to first exist in order for eyes to come into being. He is suggesting of course that they then see the light, and even some attributes of it (and its origins, in part), and of course we know now that you won't be able to see ALL attributes of it. It's really quite simple and amazing in terms of a proof, in my estimation.