(Picture taken from https://florentflora.files.wordpress.com/2012/02)
Actually, the Bible gave us some good advice as to how we could stay in God’s peace continually. But oh, on our own we might find it pretty difficult to follow what Paul told the Philippians as he said,
Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God. And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus. Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things. Those things, which ye have both learned, and received, and heard, and seen in me, do: and the God of peace shall be with you. (Phil 4:6-9 KJV)
It seems to me that ‘Positive Thinkers’, esp. of the Christian kind, took part of these verses and gave them a completely new meaning they originally did not have. Just giving you a few examples in the form of quotes here.