Don't forget! God Will...

 Psalm 50 
1 The Mighty One, God the Lord,
    speaks and summons the earth
    from the rising of the sun to its setting.
2 Out of Zion, the perfection of beauty,
    God shines forth.
3 Our God comes; he does not keep silence;
    before him is a devouring fire,
    around him a mighty tempest.
4 He calls to the heavens above
    and to the earth, that he may judge his people:
5 “Gather to me my faithful ones,
    who made a covenant with me by sacrifice!”
6 The heavens declare his righteousness,
    for God himself is judge! Selah

The Psalmist jumps right in here to give a remind to his people: Don't forget that God will judge all.  He goes on in the psalm to remind them that God is not just looking for sacrifice and religious speech; He is looking at their actions and motivations.  He is tired of their slander, deceit, and ingratitude.  He will surely judge those who only "go through the motions" where their hearts, and mouths are far from Him.