God allows suffering to His children for lessons to be learnt.. but Y?

i was reading 2 Cor 11:16 onwards whereby Paul relates the sufferings which he has undergone.

yes, our parents allow us to fall and then be picked up again to learn lessons after lessons. However, their love for us is so overwhelming that no matter what wrong we have committed, their grace overshadowed our mistakes.

God, our heavenly Father, i guess is definately filled with more love and grace than our parents on earth. Well, God is sinless and He is the creator of all.

However, this mrg as i was reading the sufferings which Paul has under went, i felt a lil perturbed. Y? Father, you allow sufferings and i m sure Your heart aches to see Your children suffer? What is the lesson that You wanted Paul to know that He has to undergo so much suffering and utimately death before Paul can learn?

we as Your children do repent and beg for mercy. Did Paul beg for mercy too? does Your heart shatter at Paul's suffering?

Father, enlighten me.. Let me know that Your heart shatters at the sight of our suffering? Let Your mercy be upon us. U said in Your words, those who judge without mercy shall be judged without mercy too. Then if that is the case, why did Paul suffer and then die without mercy? or his objective as Your prophet is to deliver Your words but then does he deserve what he got at the end? then is everyone supposed to suffer and die before receiving Your promise in heaven?