God is the author of gain through personal labor. First, he put muscles on Adam and Eve and commissioned them to "dress and keep" (work) the garden of Eden. Gen.2:15. Then, as a result of their willful sin of disobedience, he added pain to their labors in Gen.3:19, "In the of thy face shalt thou eat bread ...." (work is productive. Idleness is ruin)
Thus the God determined principle that if a person expects to eat, they must first work and if they, being physically able, refuse to work, neither shall they eat.
Neither did we eat any man's bread for nought; but wrought with labor and travail night and day, that we might not be chargeable to any of you ....For even when we were with you, this we commanded you, that if any would not work, neither should he eat. For we hear that there are some which walk among you disorderly, working not at all, but are busybodies.
Now them that are such we command and exhort by our Lord Jesus Christ, that with quietness they work, and eat their own bread." 2 Thess.8-12.
And so, ever since Eden, honest and diligent people have all understood God's decree of "No Pain, No Gain". Therefore we should learn to embrace the inevitable pain of labor that we might gain without resentment, discouragement or avoidance of hard work.
For God's word has also decreed in Gal.6:7 that ... , that shall he lso reap."
Both sowing and reaping are work. "No pain, no gain."
This time-tested adage grew out of the wisdom and knowledge which is born only of experience. The truth of it was learned much quicker in earlier days when nothing was honestly gained except through the price of pain, labor, sweat, blisters, sunburn, sacrifice and aching muscles. And though much of material benefit is gained these days by the greedy, dishonest and lazy, the cheap gain that comes to one from other peoples labors, frugality, and pain....... character, integrity and muscle are not among them. And, in truth, health, true wealth and self-worth are also absent in those who are able but live off of the labor of the workers and tax-payers who support them. So, if you would win life's prize and eternal reward, reach out and "embrace the pain", and learn to love it for its benefits. While, at the same time, you can do the greedy, lazy takers the greatest favor you have to give ... speak out and vote against every roach, rat, and snake of character killing Socialism. Thereby helping them out of their habit of bloodsucking and consuming at the expense of others. This is the only way they will ever break out of their deadly addiction of "something for nothing".
But the God of all grace, who hath called us unto his eternal glory by Christ Jesus, after that ye have a while, make perfect, stablish, strengthen, settle ." 1 Peter 5:10.
And this from Wikipedia....
A form of this expression is found in the beginning of the second century, written in The Ethics of the Fathers 5:21 (known in Hebrew as Pirkei Avot):
Work diligently (hard) and become a leader; be lazy and become a slave.
"The hand of the diligent shall bear rule: but the slothful shall be under tribute." Prov.12:24.