Arcana Coelestia #4076
4076. 'And you yourselves know that with all my strength I have served your father' means that He acted by His own power. This is clear from the meaning of 'serving' as diligent effort, dealt with in 3824, 3846, but in reference to the Lord, as His own power, dealt with in 3975, 3977, the more so when the phrase 'with all my strength' is added.
Arcana Coelestia #3975
3975. 'For whom I have served you' means from His own power. This is clear from the meaning of 'serving' as toil and endeavour, dealt with in 3824, 3846. When these terms are used in reference to the Lord, His own power is meant, for it was from His own power that the Lord obtained Divine Goods and Divine Truths for Himself and made His Human Divine, see 1616, 1749, 1755, 1921, 2025, 2026, 2083, 2500, 2523, 2632, 2816, 3382.