25 And being confident of this, I know that I shall remain and continue with you all for your progress and joy of faith,
26 That your rejoicing for me may be more abundant in Jesus Christ by my coming to you again.
being confident of this (v.25) = being fully persuaded — referring to verse 24, that it was better for the Philippians that he live. The tense indicates Paul was persuaded in the past and remained convinced.
remain (v.25) = stay (in the flesh)
continue with (v.25) = abide in the presence of, or near (either physically with them or even just in this life and in regular communication with)
faith (v.25) — trust. Paul was speaking of their progress (strengthening) in trusting and the joy that comes with it
rejoicing (v.26) = glorying — the grounds of glorying — reason for rejoicing
coming (v.26) = being present with (parousia) — refers to a period of time, not just an event