Many believe knowing God is doing arbitrary acts of goodwill; but works of obedience garner a more excellent reward.
Mark 12:30 And thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this is the first commandment.
Mark 12:31 And the second is like, namely this, Thou shalt love thy neighbour as thyself. There is none other commandment greater than these.
1Timothy 4:8 For bodily exercise profiteth little: but godliness is profitable unto all things, having promise of the life that now is, and of that which is to come.
Piety in principle, is a compound of veneration or reverence of the Supreme Being and love of his character, or veneration accompanied with love; and piety in practice, is the exercise of these affections in obedience to his will and devotion to his service.