“Those who grumble at the little thing that has fallen to their lot to do will grumble at everything. Always grumbling, they will lead a miserable life, and everything will be a failure. But those who do their duties as they go, putting their shoulders to the wheel, will see the light, and higher duties will fall to their share.”
Pearls of Wisdom
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Swami Vivekananda 261
Indian Hindu monk and phylosopher 1863–1902Related quotes

“Of course it hurts", she grumbled, tipping my head further back. "Life sucks. Get over it”
Source: Keeping the Moon

Death and the Knight (p. 752)
Time Patrol

“Those who stand for nothing fall for everything.”
The earliest known occurance of a similar adage dates back to 1926, then apparently regarded as a common one of unknown origin. Its connection to Alexander Hamilton arose from confusion with its use in 1978 by a UK radio broadcaster also named Alex Hamilton.
Source: https://quoteinvestigator.com/2014/02/18/stand-fall/#return-note-8222-15 Per QI

“Those people who think they know everything are a great annoyance to those of us who do.”
As quoted in The Mammoth Book of Zingers, Quips, and One-Liners (2004) edited by Geoff Tibballs, p. 299
General sources