Reason to or for

Hello!

Both “a reason for quitting” and “a reason to quit” are correct in English.

Reason for + noun/gerund

Use this when the thing after reason is a noun or -ing form.

a reason for quitting

a reason for the delay

a reason for celebration

a reason for his behavior

Reason to + base verb

Use this when the phrase describes an action someone may take.

a reason to quit

a reason to worry

a reason to believe

a reason to discuss

a reason to trust him