Suffering of a sadhaka

Disciple to guru: I am religious and God fearing
person. Never do I think of hurting anyone.
However in return what I am getting is nothing but
troubles and more troubles. My neighbour who is a not
only a drunkard and corrupt person never worships God
too. However he is richer than me and has no troubles
at all. Why is God so unjust? Why does God not take
care of his devotees?

Guru to disciple: Tell me which is of more use to
an engineer – ordinary steel or hardened steel?

Disciple: Hardened steel.

Guru: How do you make hardened steel?

Disciple: By repeated heating and cooling of ordinary steel.

Guru: Can you harden steel without subjecting it to heating 
and cooling it?

Disciple: No not possible at all.

Guru: So also in case of human beings.
God subjects us to trials and tribulations with a view
that we will become strong. We can grow only by
becoming stronger. The troubles and sorrows that you
experience is like heating and cooling the steel is
subject too. A hardened person will always have more
capacity and strength to face life as compared to a
weaker person who does not experience troubles.
Hence God is more just to you as he is forcing you to
acquire the strength for your growth only. Your
neighbour has been having an easy life all along and
he certainly cannot withstand but will collapse even
when a small misfortune strikes him (as it will).
Whereas you will have the courage and strength to bear
even the mightiest tsunami.