The burden of human consciousness.
Thoughts come in a whole universe of flavors. But most of the words that categorize thought end in either"tion" or "sion".
Some tion/sion examples:
Rumination, premeditation, hesitation, deliberation,
consideration, obsession,
contemplation, compulsion, conception,
introspection, repression, categorization, recognition, reconfiguration, Memorization,
Other: Fantasize, daydream, equating, misconstrue,