“On this path effort never goes to waste, and there is no failure. Even a little effort toward spiritual awareness will protect you from the greatest fear.” from The Bhagavad Gita
“No mirror ever became iron again;
No bread ever became wheat;
No ripened grape ever became sour fruit.
Mature yourself and be secure from a change for the worse. Become the light.” – Rumi
The bottom line is that any effort you take to improve yourself will not be a waste of time.
“He who has always spared himself much will in the end become sickly of so much consideration. Praised be what hardens!” – Nietzsche
Essentially if you choose to live a life of ease and comfort you won’t be satisfied with the results. He suggests to push yourself and look upon the hardship and struggle as a blessing for it will help you to forge yourself into the person you should and can be.