1) Deficient creatures seek benefit for themselves. Seeking benefit, then, is the objective of human action. Efficient beings do not seek benefit for themselves as they are free from deficiency. Likewise seeking benefit for themselves is not the objective of the actions of efficient beings.
2) God is the only efficient Being and thus it follows that whatever He does is not for His own benefit, as He is not in need of it, but rather it is for the advantage of the deficient creatures who seek benefit from His efficiency.
3) As God also knows where the benefit lies for each of His dependents, His acts regarding us are both generous and wise, even if we fail to recognize how or to what extent.
This seems logically sound but is only realized through faith.
Have a good opinion of Allah.