There is an anecdote that when Jean Leray introduced spectral sequences on a conference,
the famous mountain climber Hassler Whitney left the room, saying:
If this is algebraic topology, I don’t want to have anything to do with it.
Now it’s time for us.
Steve Mitchell - An Essay on Spectral Sequences
Ravi Vakil - Spectral Sequences: Friend or Foe?
Allen Hatcher - Spectral Squences
Timothy Chow - You Could Have Inveted Spectral Sequences
Bott & Tu - Differential Forms in Algebraic Topology, chapter §14