When writing about big philosophical ideas in Russian, using special abstract nouns can really help your writing. Here are seven important abstract nouns you can use:

1. Сущность (suschnost') - Essence
   Example: "Сущность существа заключается в его способности к самосознанию."
   ("The essence of a being is its ability to be self-aware.")

2. Знание (znanie) - Knowledge
   Example: "Знание — это не просто информация, а процесс понимания."
   ("Knowledge isn't just information; it’s about understanding.")

3. Истина (istina) - Truth
   Example: "Истина часто скрыта за призраками иллюзий."
   ("Truth is often hidden behind illusions.")

4. Свобода (svoboda) - Freedom
   Example: "Свобода выбора — это основа человеческой жизни."
   ("Freedom of choice is the foundation of human life.")

5. Справедливость (spravedlivost') - Justice
   Example: "Справедливость требует честности и знаний."
   ("Justice needs honesty and knowledge.")

6. Мудрость (mudrost') - Wisdom
   Example: "Истинная мудрость приходит с опытом."
   ("True wisdom comes from experience.")

7. Смысл (smysl) - Meaning
   Example: "Смысл жизни находится в поиске гармонии."
   ("The meaning of life is about finding harmony.")

As you write, try using these nouns in longer sentences. This way, you can explain your ideas more clearly.

Practice rewriting sentences to really understand these concepts. Speaking about these ideas with others can also make your writing even better!