Be careful what you think, because your thoughts run your life. Do you want to be happy tomorrow? Then sow seeds of happiness today -count blessings, memorize Bible verses, pray, sing hymns, spend time with encouraging people. Do you want to guarantee tomorrow's misery? Then wallow in a mental mud pit of self-pity or guilt or anxiety today assume the worst, beat yourself up, rehearse your regrets, complain to complainers.