HE WHO ALWAYS SPECULATES AS TO WHAT AWAITS HIM IN FUTURE, ACCOMPLISHES NOTHING WHATSOEVER - THE SPAN OF LIFE IS SO, SO SHORT...

Disciple: Well, sir, I take it for granted that money will come, and you will begin that good work. But what will that matter? Before this, also, many great men carried out many good deeds. But where are they now? To be sure, the same fate awaits the work which you are going to start. Then what is the good of such an endeavour?

Swamiji: He who always speculates as to what awaits him in future, accomplishes nothing whatsoever. What you have understood as true and good, just do that at once. What's the good of calculating what may or may not befall in future? The span of life is so, so short—and can anything be accomplished in it if you go on forecasting and computing results. God is the only dispenser of results; leave it to Him to do all that. What have you got to do with on working.
- Swami Vivekananda
The Complete Works of Swami Vivekananda/Volume 6/Conversations and Dialogues/II