Truth is absolute. One person coming to a different conclusion then another person does not change the fact there is only one ultimate truth. Saying that truth is subjective is confusing truth with opinions. I have rarely claimed to know anything for certain. I can tell you however, that after years of work I have come to conclusions or rather probabilities of what is true and what is certainly not true. The only way to come to an ultimate truth is through reason, logic and mathmatics. Anything that I conclude through any other means, I could never call a certain truth. I think it is absolutely possible to answer lifes big questions of existance using reason, logic and mathematics. I'm currently working on that but I've not accomplished it quite yet! Maybe one day!