We live a transitory life with our eyes on the life eternal

^15-18 We wish you could see how all this is working out for your benefit, and how the more grace God gives, the more thanksgiving will redound to his glory. This is the reason why we never collapse. The outward man does indeed suffer wear and tear, but every day the inward man receives fresh strength. These little troubles (which are really so transitory) are winning for us a permanent, glorious and solid reward out of all proportion to our pain. For we are looking all the time not at the visible things but at the invisible. The visible things are transitory: it is the invisible things that are really permanent.