''Delivering a commencement address is a great responsibility, or so I thought, until I cast my mind back to my own graduation.''

what does ''or so I thought'' means?

Question

''Delivering a commencement address is a great responsibility, or so I thought, until I cast my mind back to my own graduation.''

what does ''or so I thought'' means?

Answer

Hi Seokho, it means that they were wrong in thinking it would be a great responsibility.