The Self is the hardest tool to use because you must live your entire existence through its lens, and for the vast majority of people who have ever existed or currently exist, it’s not a tool but their God.
For the brilliant to the retarded and for the sociopathic to the pious, too frequently Truth equals satisfaction of the self, often even in noble pursuits and many times among “men or women of God.”
Yet if you sincerely accept that Truth is Divine reality, due to the “flexible nature” of man, then it simply becomes a question of which Divine reality? Your morality must then derive from what you accept as Divine Truth, aka religion.
You can never view the self as a tool if you view it as “God.” Even if you accept yourself as a means to Divine ends, it’s frequently those chasing false idols who are often mentally deranged.
As a rational, stable individual, viewing yourself as a tool of the Divine feels odd. You don’t want to be associated with the loony bin. That’s understandable, but it still doesn’t change the fundamental reality that the “YOU” you are so proud of is just an ever-changing series of Divine decisions—therefore, you must view yourself as an instrument of the Divine, despite the urge not to.
I know this is kinda gay, but the key is to have a clear and clean heart with sincere love for others. Only then can you truly connect with the Divine in a meaningful way. That’s the only path to Truth.