待我强大必废毁我之人
[dài wŏ qiáng dà bì fèi huĭ wŏ zhī rén]
Wait Until I Am Strong: A Promise To Destroy Those Who Destroyed Me: Implies that currently the person might feel powerless or vulnerable due to previous adversities, but harbors strong determination to grow strong in order to seek vengeance upon or destroy those people who have done them wrong