Because faith makes invisible things real and visible things unreal, earthly dissatisfaction becomes the road to heavenly satisfaction. (Joni Eareckson Tada, evangelical author and founder of a compassion ministry) 

It’s a paradox that people of faith have come to realize: things that are not seen may be more real than things you can see and touch. God’s good plans for those who trust Him are not necessarily physical or temporal; they are spiritual and eternal.Now faith is being sure of what we hope for and certain of what we do not see. (Hebrews 11:1). For what is seen is temporary, but what is unseen is eternal. (2 Corinthians 4:18)