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This is enough for them", is a pre decided quantity in one's head before helping others in need.
Overlooking other's crisis and misery, when one has the privilege of comfort and luxury, can be an automated notion in one's subconscious at times.
Helping is not just about self satisfaction, rather it must also be about mending the ridges created within a society, and if the intention of giving is to help, then there should be no question of a right "fixed amount" set by oneself for others.
Provide help within one's power and wealth, not vice versa.