It takes the wind of God’s Holy Spirit for wings to mount up on:”The wind bloweth where it listeth, and thou hearest the sound thereof, but canst not tell whence it cometh, and whither it goeth: so is every one that is born of the Spirit.”  (John 3:8)  “…He bringeth the wind out of His treasuries.” (Psalms 135:7) “And the cherubims lifted up their wings, and mounted up from the earth in my sight;” (Ezekiel 10:19) It takes waiting on the LORD and His Spirit so we can hear and understand; when His word comes to us, whether during our personal devotions or in a message preached, we are enabled to mount up above the trials of life and we can see, for a moment, as the LORD Sees.
Now we are able to run because we now can see! God has mounted us up and we got a vision and the day is bright. Our pathway is clear our direction is certain; the goal is in full view. So we run, busying ourselves tirelessly in the work that is set before us, knowing exactly what the Lord has given us to do and the purpose of it. We are not weary, because we waited on the Lord and we were mounted up on wings as eagles and we were given a vision. We exclaim with the apostle Paul, ” I therefore so run, not as uncertainly; so fight I , not as one that beateth the air:  (1 Corinthians 9:26)
But there comes a time when ” the night cometh, when no man can work”  (John 9:4)
We still have our lamp; there is still light within our vessel, but the sun has ceased to shine and the light of the lamp will only shine a short distance into the night. If we run now, we will be injured or get lost. To mount up would be useless because of the darkness all around. No, now is not the time to mount up nor to run; darkness is upon us. Now is the time to walk.
“They shall walk and not faint.” Darkness can be very frightening like the apostle Paul said in 2 Corinthians 7: 5  “…without were fightings, within were fears.”  And fear can bring cause us to want to run. But we must walk and again, wait on the LORD. Though we walk slowly, cautiously, and sometimes even fearfully, yet because we wait upon God we have been promised that we will not faint. There will always be that comforting voice behind us saying “this is the way, walk ye in it”. And we have God’s unchangeable word which is “a lamp unto my feet and a light unto my path” (Psalms 119:105) It cheers us in the darkest hours and rallies us onward promising us that “weeping may endure for a night, but joy cometh in the morning.”  (Psalms 30:5)
“To everything there is a season, and a time to every purpose under the heaven:” (Ecclesiastes 3:1)
There is a time to mount up; there is a time to run; there is a time to walk; And even so, there is a time to lie down.
Psalms 23:2 “He maketh me to lie down in green pastures; He leadeth me beside the still waters. He restoreth my soul…”  thy rod…, yes Lord even thy precious rod, it comforts me!

“I wait for the LORD, my soul doth wait, and in his word do I hope. My soul waiteth for the LORD more than they that watch for the morning…” Psalms 130: 5-6