Sea may be compared to life: sometimes we get a harsh and stormy sea, at other occassion, the see becomes gentle and serenity. But being in gentle sea, never made a great and good sailor.
Taking bootcamp as another example. Playgrounds are not where good soldier is made; good soldiers are only produced at bootcamps.
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Parents who shield their child all the time from hard situations will produce an idiot of a child in the end.
Saving people from tough troubles are sometimes not the best way they need to show love all the time. but allowing them go through those trouble for them to learn from it.
Every great person is a product of tough circumstances.
Even purest gold undergoes through the hottest fire
But this doesnt always mean that every body that goes through hard times comes out very strong. Some do not.
Simply put, it is not just what happens to a person but your reaction with what happens to you ought to make the difference.
If life puts you in tough and hard situations, your reactions shouldnt be "why me?", but say "try me".
Be adaptable!