There are personal truths for what is personal philosophy of life, but your truths directing decisions effecting/affecting potential futures.

There are the little truths we share like hey man don't walk into that tree.

But, is there a universal truth for all of us? This requires experimentation, a discussion (about all the personal truths we use for one's self) between many People at a level of personal depths of inner information. The majority of humans would shy away from participation. It must be a set and setting from, which all participants feel trust, safe and equals with all others in the room. The more detail I put into this thought of how to come up with an answer to is there a universal truth for all of us...the more the experiment will be come too difficult of most humans to participate.

...my two cents of the cuff...