We do not want to become double-minded

As God's children, we want to always maintain a single-minded focus.  In other words, if we keep our self single-minded we will keep our spirits healthy.  We keep ourselves healthy when we keep the darkness out and only let in the light and keep ourselves focused on what is good.  Because there is a danger if we allow ourselves to become double-minded.  It says in James 1:7-8 8 (AMP) "7 For truly, let not such a person imagine that he will receive anything [he asks for] from the Lord, 8 [For being as he is] a man of two minds (hesitating, dubious, irresolute), [he is] unstable and unreliable and uncertain about everything [he thinks, feels, decides]."  When we become double-minded, we bring instability into our life and we take ourselves out of position to receive from the Lord.