The "Forgotten" God

Hosea13: 4 But I am the Lord your God from the land of Egypt;
you know no God but me, and besides me there is no savior.
5 It was I who knew you in the wilderness, in the land of drought;
6 but when they had grazed, they became full,
    they were filled, and their heart was lifted up;
    therefore they forgot me.

Why did they "forget God"? Was it because He was not around, never did anything for them, or never listened to them anymore? No, they chose to forget, shut Him out, not acknowledge or interact with Him. He was still providing, offering guidance, courage and comfort, but "their heart was lifted up," they became self-absorbed and seemingly self-sufficient. God is by no means forgettable, unless we in pride decide to do so. But eventually, like Isreal, we will have a rude awakening that God is here, and He is not silent.