Your Lampstand -Revelation 2:5

Rev 2:5 Consider how far you have fallen! Repent and do the things you did at first. If you do not repent, I will come to you and remove your lampstand from its place

ἐκπίπτω * ekpiptō * ek-pip'-to * From G1537 and G4098; to drop away; specifically be driven out of one's course; figuratively to lose, become inefficient: - be cast, fail, fall (away, off), take none effect.

They left the path. They are some place now where they shouldn't be. They were once in and on the way, but have stayed on unfamiliar ground. Jesus says they have fallen. This passage seems to indicate it may be possible to know the love of Christ. yet grow grow distant and cold. 

The answer to their plight is given by Jesus. The danger is there for all of us, as is 

It is the same requirement that allowed for grace: repent and change your ways. Turn back to God. Always turn to God.

Or else

ei de mē(ge) * i deh may'-(gheh) * From G1487, G1161 and G3361 (sometimes with G1065 added); but if not: - (or) else, if (not, otherwise), otherwise. 

There is but one outcome given if they continue the path they tread. 

Am coming (quickly KJV)

τάχος * tachos * takh'-os * From the same as G5036; a brief space (of time), that is, (with G1722 prefixed) in haste: - + quickly, + shortly, + speedily.

Assuredly as a pebble dropped from the hand falls to the ground; as the next step follows the one before.

Unless

ἐὰν μή * ean mē * eh-an' may * That is, G1437 and G3361; if not, that is, unless: - X before, but, except, if no, (if, + whosoever) not.

This is an example of mercy offered to the sincere heart.  The Father continually calls to us in this time of grace, but His patience is not infinite.  The lamp stand that represents the believers here in Ephesus is in danger of being removed.   As the light fades in this assembly, so does the need for a lamp stand.  The same applies to that place in our heart where we have made room for the light of the world.

Matthew 5:14-16  “You are the light of the world. A town built on a hill cannot be hidden

15 Neither do people light a lamp and put it under a bowl. Instead they put it on its stand, and it gives light to everyone in the house. 16 In the same way, let your light shine before others, that they may see your good deeds and glorify your Father in heaven

Revelation 3:19 Those whom I love I rebuke and discipline. So be earnest and repent.

Revelation 3:3 Remember, therefore, what you have received and heard; hold it fast, and repent. But if you do not wake up, I will come like a thief, and you will not know at what time I will come to you