This question cannot be answered. Intelligence is not an incidental feature that can be separated from the concept of “man” and considered “man in himself.” Intelligence is what makes a person human. Without reason, your question would be impossible with all the concepts included in it: “man”, “gift”, “curse”, “reason” itself. Without reason, man would be an animal, incapable of speech, abstract thinking, and reflection, unable to ask any questions, and ultimately simply not human.
This question cannot be answered. Intelligence is not an incidental feature that can be separated from the concept of “man” and considered “man in himself.” Intelligence is what makes a person human. Without reason, your question would be impossible with all the concepts included in it: “man”, “gift”, “curse”, “reason” itself. Without reason, man would be an animal, incapable of speech, abstract thinking, and reflection, unable to ask any questions, and ultimately simply not human.
Reason is man's happy gift — and his curse. /E. Fromm/
Reason is given to man in order that he may live intelligently, and not only that he may see that he lives unreasonably.