What is meant by the Bible verse "when I am weak, then I am strong" (2 Corinthians 12:10)?

It means that in times of weakness I am going to ask for the power of God to help me and strengthen me. We can obtain this power through reading the Bible, reading spiritual books, receiving the Holy communion, praying from the agbia, and through repeating over and over, “My Lord Jesus Christ have mercy upon me!� this small prayer is called the ‘arrow prayer’ because it pierces the heavens and reaches the Lord, and we receive a reply on the spot.

This Q&A was found on Archangel Michael & St Bishoy Coptic Orthodox Church : http://www.stbishoy.org.au/modules/smartfaq/faq.php?faqid=40