“And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever; Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you.”
John 14:16-18
Most of us don’t like being alone for extended periods of time. In fact, we are not designed to live in isolation 
Even at the very beginning, God said, ” It is not good that the man should be alone” (Gen. 2:18). But sometimes situations in life leave us separated from others. Or perhaps we simply feel lonely, even though we live with our mate or family. But whatever your situation may be, if you are a believer, you’re never alone 
Knowing His followers could feel abandoned after His crucifixion and ascension, Jesus promised to send them a Helper who would never leave them – the Spirit of truth. The same One who came to them at Pentecost still abides within every believer. He has been sent to walk alongside us as our comforter, enabler, and guide.
The Holy Spirit, unlike human companions, is perfectly adequate to meet our every need. Since He knows us intimately, He can comfort us in pain and loss when no one else can 
Anytime we find ourselves in a quandary, He knows exactly what we ought to do. Since the future is laid bare before His eyes, He’s aware of all the details that concern us. What’s more, He promises to guide us each step of the way, calming our fears and overcoming our inadequacies.
Because we were created for God, only through His Spirit are we made complete. He is the ultimate solution to man’s aloneness: He’s always available and will never forsake or forget you. When others let you down, the Comforter is present to lift you up with the reminder that you’re not alone 
Source: http://www.crosswalk.com
