It is important to invest, when the investment has great potential. But I think it is a good decision to also have reserves, because you may it need in the future and this can make a difference.
This is the reason I don't invest my 100 earning. I always prefer to hold some money in my hand or my wallet for any urgent need.
investment is good and recommended from me but you should always keep a part of your money with you and invest only whatever you can afford to loose..
whenever you invest prefer your self for loose also. not only hope for profit.