"Build up your strength in union with the Lord and by means of his mighty power." (Ephesians 6.10 GNB)

To build up strength, I exercise regularly and, from time to time, I increase the intensity of the exercise. It is a gradual process that took years.

And if I stop my regular exercise, my strength regresses. So this is something that I want to maintain for as long as I am able.

Likewise with spiritual life. I need to regularly exercise my faith to build up my experience and strength from seeing God working in my life.

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Related:
God's word
Offer sacrifices
If you have faith