Columbia subject headings:
Harvard subject headings:
Likhachev, D. S. (Dmitriĭ Sergeevich)--Philosophy.
Likhachev, D. S. (Dmitriĭ Sergeevich)--Philosophy.
Philosophy
Princeton subject headings:
Aphorisms and apothegms.
Learning and scholarship--Quotations, maxims, etc.
Quotations, Russian.