"You may be disappointed if you fail, but you are doomed if you don’t try" Attributed to Beverly Sills. By request.
"we are all sinners" An acknowledgement of the fundamental moral fallibility in being human. Also calibrated: "we are all sinners blind to our innate innocence."
"There is no elevator to success. You have to take the stairs." Attributed to motivational speaker Zig Ziglar.
“If you have the choice between being right and being kind, choose being kind” A quote attributed to Wayne Dyer.
"easy come, easy go" The phrase can be used consolingly after a loss, implying that since the gain was effortless, the loss isn't a significant matter -- Brave AI.
too good to be true Seems better than you had expected, and you think there may be something wrong with it that you have not noticed -- collinsdictionary.
misery loves company People who are unhappy may get some consolation from knowing that others are unhappy too -- dictionary.com.
“Keep calm and carry on” Slogan that appeared on a motivational poster produced by the Government of the United Kingdom in 1939 in preparation for World War II -- wikipedia.