The quality of being strong is characterized by the ability to attract riches to one's self and keep the riches from being stolen, lost or taken away by force.
Therefore it supposes that when one builds up strength, riches will also increase. The more strength you have the stronger you become, and the more riches you can contain and retain.
Proverbs 11:16b "...strong men retain riches."
How can i become strong?
Daniel 11:32b "...those that know their God shall be STRONG and they shall do exploits"
The more you know God, through studying his word, reading the bible daily, the stronger you become.
Knowing God more, makes you a stronger person in life, and the stronger you are, the more you attract riches to yourself and the better you become at retaining them and keeping them from being stolen, getting lost, or being taken away by force.