Only he who bestirs himself can advance spiritually. The fool who uses extraneous aids for this, in the form of the ready-made opinions of others, only walks his path as if on crutches, while ignoring his own healthy limbs.
Morality without religion is only a kind of dead reckoning - an endeavor to find our place on a cloudy sea by measuring the distance we have run, but without any observation of the heavenly bodies.