There's a common misunderstanding among Christians. I'm sometimes guilty of it myself.
It's believing that eternity starts now, believing we shouldn't have problems (financial, health, relationship, etc.) because we're believers.
It's true that Jesus defeated Satan, sin, death, sickness, evil, pain, suffering and sorrow in the spiritual realm when He died and rose again. But the full revelation of that victory won't come until heaven (Hebrews 2).
Christ assures us that even though He's overcome the world, we'll have troubles during our earthly lives (John 16:33).
We're in the process of receiving eternity, so we still experience testing, trials, struggles and attacks (Ephesians 6:12; Hebrews 12).
Our world and our bodies are in bondage to decay, but "our present sufferings are not worth comparing with the glory that will be revealed in us" (Romans 8:18-25).
Let's live with eternity in mind, but let's remember we aren't there yet!