EVIDENCE To Know and Have It All?

The reality is; there is something which exist but what that something is; remains a question. Either because we are not capable to reveal it yet or because with time and movement it changes itself and has no truth in it. But what's the reason for its existence without having or revealing any truth, that's the evidence we need to find. As with existence we desire to know how it begin and what was beyond it and how and why it all happens.
And if we can't know it without believing or assuming or if there is no final answer to these questions then one assumption is; everything happens accidentally and have no purpose behind it. And we could have any meaning based upon our individual senses or reasons and live very well with it. But if there is no one end purpose for everything then no matter how we choose to live, the whole process of existence becomes tragic.
Each one could hate any limitation in freedom, in having, and in the knowledge that's why nothing is good enough; we must know and have it all. And if there is no evidence, then without assumptions we must find it. As to know and have it all is about individuality because each one has the right not to live under the mercy of anyone with more power. So, for freedom and protection, one desires to know and have it all, but the questions remain.