A compelling reason to be selective about knowledge is that our present life span is so short. Regardless of how old you may be, there are undoubtedly many fields of knowledge that you would like to investigate, but you realize that you will simply not live long enough to do so.
आप किस तरह का ज्ञान लेंगे, इस बारे में सोच - समझकर चुनाव करने की एक ठोस वजह यह है कि आज हमारी ज़िंदगी बहुत छोटी है ।