WE can't improve our life until we improve our thinking because thoughts are powerful, decisive and they drive us eventually. Bible says 'As one believes is he' [Proverbs 23.7]. Thoughts are pictures of mind that have constructive/destructive possibilities having power over our emotions. Thoughts are more than imaginations because imaginations are spontaneous, can be induced by external inputs also [Genesis 15.5] whereas thoughts are deliberate, created by us [Romans 12.2]. They can hold us in bondage if negative or fill us with excitement, joy, peace and hope if positive. So Believe what GOD/BIBLE says to discipline your thoughts in order to remain in high spirits and to become more productive.