It is a painful thing to say to oneself: by choosing one road I am turning my back on a thousand others. Everything is interesting; everything might be useful; everything attracts and charms a noble mind; but death is before us; mind and matter make their demands; willy-nilly we must submit and rest content as to things that time and wisdom deny us, with a glance of sympathy which is another act of our homage to the truth.
Antonin Sertillanges, The Intellectual Life: Its Spirit, Conditions, Methods
choices, generalist, specialization