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Imam Ali (a.s) -the first leader of Isalm after the Prophet Muhammad (P.B.U.H) -said:

(be aware) there is not any price for you save everlasting prosperity and paradise, so do not exchange it for any other price.

brief description:

usually when somebody is asked about the price of capital of his existence, he can not assume any price for it.
however, he exchanges this great capital gradually and day by day for a little price, and sometimes at the end of his life, he finds that he has exchanged this great capital with a house or a car or a country villa, and still he will leave them soon.
ali (a.s.) says that none of the material capitals of this world could be exchanged with the capital of your life. the only thing which could be exchanged with it, is god's satisfaction, human and spiritual development and also an eternal and everlasting prosperity. it is worthy to endeavor, attempt and sacrifice for this purpose as much as you can.

Ahj-ul-bahaghah

قال مولانا علی ابن ابی طالب علیه السلام

إنَّهُ لَيْسَ لاَِنْفُسِكُمْ ثَمَنٌ إلاّ الْجَنَّةُ فَلا تَبِيْعُوها إِلاَّ بِها

بهای شما چیزی جز بهشت نیست پس آن را جز به بهشت نفروشید

نهج البلاغه