A couple of weeks ago my husband bumped into an old 'school friend'. This guy had always been pretty much known as trouble. He was asking my husband how things were going, and knowing he was a Christian started asking questions about God.
My husband came away from the conversation knowing that he had to understand there were reasons behind people's behaviours. This guy opened up to him a little and shared some quite terrible things he experienced as a child, he was really feeling now an emptiness in his life, which he thought may mean he needed God.
Around the same time I met a lady who decided to come and find out what was going on at Church and came to our ladies that lunch meeting. I recognised her as being local and it was nice to get to know her, I was impressed by the courage shown to just arrive on your own, without being dragged along by a friend.
A few days later whilst in prayer for these two people, God showed me a picture of a bridge starting at one side of a stream. It was incomplete, piece by piece it was reaching across to the other side. I think I take it to mean we can reach out and pray for our unsaved friends and family on the other side of the stream, but we cannot complete the spiritual journey for them. We cannot build it all the way across or it would not be strong enough. It would collapse.
They also have to build their side of the bridge and come towards, what we through the Holy Spirit, are praying for them and teaching them. As we pray and they come, we reach the centre where God becomes the most important central piece, the 'keystone'.
We can pray all we like for the unsaved and it is a good thing to do, and they can reach out towards what they feel is missing from their lives, but without God as the central point our bridge will collapse, we will not save them and they will not find piece.
So, keep building your bridges towards the unsaved, but don't take it as a personal failure or rejection if they don't respond and build their side back towards you and find God.