Philip 2:13 says that God is working in us to will & do of His good pleasure. In light of the idea of working out our salvation with fear & trembling from verse 12, we could see God as our work out trainer – helping us have the desire & power to do what He wants (work out our salvation).
God is working in each of us. When Paul wrote this, he used the present tense & in Greek, this means an ongoing & continuous action. So God is working in you & me today, even at this moment, helping us to have the desire & abilities (resources, etc) to accomplish His will. If you get more specific, those times in your day when you feel like being kind, patient, friendly, generous, forgiving (see the fruit of the Spirit in Galatians 5) – these are God moments. He is working in you – be encouraged & offer Him some cooperation (I can’t say that word without thinking of Seasame Street).
Make today a God-watch day – watching for Him working in you His desires & abilities!