I don't know if anyone here has taken formal logic, but in it truth is defined as "the way things actually are." Whether a "statement" is true or not depends on whether or not it describes the way things actually are. Any given "truth" is then simply an affirmation of a part of reality. If there is an ultimate truth, then it would be an affirmation of all of reality, and all possible realities. If that truth is to be independant, and needing no explanation (cause), as is claimed by the theist, then that truth must simply "be." Being is reality, and simply to be, is the quintessential of reality. Truth is what actually is.
Consider this, if I am a truth, then I am composed of truths. The truth that I am is the person writing the post. The composition of that truth is several more necessary truths (atoms, and energy, etc..). It can be seen that the truths that compose me, are also part of the composition of other truths (the people who wrote the other messages on this thread). It may also be shown, perhaps, that these truth that compose me, and others, may also be composed of several other truths, and so on. An ultimate truth would be composed entirely of that which could be made into anything. If this were true, then that ultimate truth would have to be infinite, and contain within itself the possibility for any constructed thing. I am a truth because I am part of what is real. The utterance of my name, therefore, in conjunction with the intent that it is me that is being spoken of, therefore is a true utterance, since it describes (perhaps in an incomplete way) what is real. If God is real, then God is a truth. To simply say "God" with the intent of referring to that existing thing which we call God, is therefore to affirm a truth , and the utterance "God" would be a true utterance. Truth needs no affirmation to be true, truth simply is what is. The truth of a statement is simply an affirmation of what is already true.