"...as (a man) thinks within himself, so he is."
A.W. Tozer had it right when he said, “What comes to mind when you think of God is the most important thing about you.”
There is no more serious business in all this life than to think of God aright. For, to the extent that our concept of who He is varies from the truth, we are guilty of idolatry.
To think unworthy thoughts of God is to impugn His righteous character, besmirch His holy Name, and call into question His flawless faithfulness. It comes as no surprise when a lost and spiritually-blind world doubts the goodness of their Creator, but it is unutterably grievous to the LORD when His own blood-bought children do so. And how do unworthy thoughts manifest themselves?
Most often in our speech, since our mouth speaks from that which fills our heart (Luke 6:45). Unworthy thoughts produce unclean speech (Ephesians 4:29; 5:4). In the former we lose our joy of worship, in the latter our testimony among men.
Philippians 4:8 is vital, if we are to be restored in thought and speech. May the Holy Spirit increase our desire and determination to think on our God worthily.