Yes it is very complex. The line between destiny and efforts to change the destiny is very thin. But without making efforts it will not be possible to know. If a family member is sick, the first option is to take him to doctor. Praying to God's mercy is secondary. It will be a matter of faith who to thank when the patient is cured- the doctor or the God ? In between safe answer is both. But that is not the whole truth. In every situation, it is optimism that works not passimism. Passimism is taking no action, optimism is taking action, whatever may be the result. At least there is no guilt feeling that this or that could have been donee.