Sight just comes so naturally to us. Faith is often counter-intuitive. Faith often stretches us and asks us to trust beyond what we see. Sight would say Goliath beats David; the lions tear Daniel apart; the furnace consumes three teenagers; Christ is defeated on the cross and many more examples.
Faith asks us to loose our life so we can find it. Faith says you have to die in order to live. These things are counter-intuitive, i.e. they are counter to our understanding. When we walk by sight we will often walk in fear. Fear of something outside our expereince or our comfort zone. Fear of something different.
When we walk by faith, we- by the grace of God- can set fear aside and walk. Walk asking God to reveal Himself to us. Walk looking through His Word. Walk seeking His understanding and not ours. Then respond in faith to what or where He calls us to go.
I admit this is difficult to do. However, His divine power has given us everything we need to walk by faith. Therefore, when we encounter something that challenges our understanding (our sight), we need to take it to God and see where He may be moving or calling.