Swami Gulagulaananda said:
"Take a slice of bread, put jam put on one side, and put another slice on it. You get a sandwich. But if you move the slices apart, the jam is always stuck to the first slice, not much to the second slice, except when the first slice is torn apart"
If you perform this simple task, you will find that this is a fact. What Swami Gulagulaananda is trying to say here is this - Things that are with you from the beginning, always override the latter. It also indicates the direction of loyalty in a situation that involves mutually exclusive forces.
The two bread slices indicate mutually exclusive forces, each trying to pull the one caught between them towards the other side. But, the slice which originally had the jam will have a higher chance of retaining it than the other way round. This is true with people as well. Just open your eyes and look around, and you will see that the quote holds good always, except when the first slice of bread has been torn apart. Bread being torn apart, indicates bad relations.