What you gave is your only investment

What one gives to others is the only thing he gets. There is a famous sarcastic saying about misers which goes like this: "A miser is a greater donor than a Daata! Well, the reason is that a Daata will give away his things to others and may be uses a little portion of his money, whereas a miser gaurds his money his entire life and without he enjoying any bit of it, people take it away after he dies :)". A person who does not help others cannot be helped even by the God.

Once there used to live a great miser, who never gave anything to anyone. He obviously reached naraka and was given huge unbearable punishments. He used to lament very much for his poor state and beg God everyday to save him from the naraka. God, as usual, took pity on the poor state of the miser and wanted to somehow find a way of helping him. But even with a lot of effort, a few meetings with Chitragupta, finds nothing which the miser gave to anybody in order that God can give him something. Finally God managed to find a tiny piece of good that the miser did in some of his janmas:

The miser once, somehow, gave a small piece of spoilt banana to somebody. God, seeing it as an oppurtunity to help the lamenting miser in naraka, made a stick appear before him — with which he could climb out of naraka. The miser very happy to have received the fortune, quickly began climbing the stick. Other people in the naraka, who were also longing to get out of naraka, tried to use the stick to get out. The miser started pushing down all the other people and was saying that "the stick was provided for me by God, and you cannot use it". Immediately the stick dissappeared and the miser was back in the naraka.

Morals in the story:

One must always share whatever he has with others. A person who is a miser will never deserve higher worlds.
Even God cannot help people who do not help others. Everyone has to bear the consequences his own karma. The easiest way is to do good karmas in the name of God, and let Him decide the vidhi. There is no need to blame the God for our difficulties. It was our own karma which gave us the difficulties.