The continual burning of the candles in the temple depended on the pure oil.
If the flame is burnt out in your spiritual life, if the passion has regressed, and the zeal has subsided, it may be time for an oil check.
If you want the joy and passion of salvation restored,check your oil. See what "dead flies" Ecclesiastes 10:1 or "leaven"1 Corinthians 5:6-7 may be corrupting your spirit, and hindering you from being on fire for God.
Warmest thoughts and prayers,