I am currently reading "Lives," the magnum opus of the 1st century Roman writer Plutarch.
In his account of Numa Pompilius, the legendary successor to Romulus, Rome's first ruler, Plutarch speaks of the Greek Pythagoras thusly:
"[He] ... conceived of the first principle of being as transcending sense and passion, invisible and incorrupt and only to be apprehended by abstract intelligence ... all access to God [was] impossible except by the pure act of the intellect."
This doctrine of the Greeks found its way into the apostate Christian church through Greek converts steeped in the tradition, as it had earlier found its way into the Jewish church through the likes of such as Philo, and it reigns supreme today.
How refreshing and daring the declaration of Joseph Smith, supported by John 17, that we can know God, we MUST know God and that we, as Paul declared in Acts, are veritably His offspring. Though we are mortal and flawed and He is immortal and sinless, yet He declares throughout scripture that we are His children.