Strength is not tested or demonstrated during times of ease. Rather, it is during times of adversity that one finds out just how strong he is.
God has a calling on each man’s life. Furthermore, He enables men to fulfill their appointed work. Man, however, must be strong and DO the work.
During times of battle, believers commonly find themselves to be underdogs. Faith, however, refuses to retreat and trusts God to overcome superior foes.
Man must spend his strength on things that matter. In doing so, we must focus our efforts upon the right things while working through and by God's power.