Yes these phrases are worthy of attention and are a source of optimism along with happiness and promotes the person to enjoy every blissful moment of life. However, one should also try to make a bad moment or the down-levelled moment into a positive and good one. Life is just for once so one should enjoy and make use of it the most.
Being judgmental and critical thinking is what most people do about other people...Good tips that are practical and help you in becoming better but I dont concur any role model because everyone has flaws and one can only admire some quality in others , other than that it is best to follow your own path in life !
Pay no mind to those who talk behind your back, it simply means that you are two steps ahead !!!