on one hand, the truth is everywhere, the question is can you see it?
on the other hand, the most important truth (personal truth) is in you, in the depths at the center/core/heart of your being, you (your true self) are the truth, the question is can you see it?
also, 'to see' means not using ordinary senses (like eyes), it means using pure consciousness (free from sensory input), ie. you'd be 'the seer' (or more correctly: the experiencer of seeing), in direct contact with the truth, experiencing it as it is - that is what a true believer is (he who experiences the truth as it is, he who lives the truth and within the truth)
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