I ___ think I had it in me 5 letters

Crossword clues for I ___ think I had it in me 5 letters:

THINK: Reflect
THINK: Muse
THINK: END OF QUOTE
THINK: Use the bean
THINK: Use your noggin
THINK: Use your head
THINK: Put your mind to work
THINK: IBM's __ exhibit
THINK: Motto for the office wall.
THINK: Ideate
THINK: See 1-Across
THINK: Brainstorm
THINK: Use one's bean
THINK: Ruminate
THINK: Cogitate
THINK: Reason
THINK: Rack one's brains
THINK: Aptly named Final Jeopardy! theme song
THINK: Assume
THINK: Sign on an office wall.
THINK: Kind of tank
THINK: Use gray matter
THINK: Concentrate!
THINK: Something to do twice?
THINK: With 19-Across, reconsider ... or a hint to the starts of the five starred clues
THINK: Get ideas
THINK: Use one's gray cells
THINK: Get lost in a brown study
THINK: Be reasonable?
THINK: Do some cerebrating
THINK: Exercise one's gray matter
THINK: Use one's head
THINK: C'mon, Aimee, ___! There's gotta be a good clue out there for this word ...
THINK: End of the observation
THINK: IBM slogan that inspired an Apple slogan
THINK: Try to remember!
THINK: Type of tank
THINK: Tank type
THINK: Dream (up)
THINK: Ponder
THINK: Believe.
THINK: Good motto for everyone.
THINK: Sign in an office.
THINK: Corporate motto
THINK: Famous IBM office sign
THINK: Old IBM motto
THINK: Just _____!
THINK: With 61-Across, carefully consider ... or a clue to this puzzle's theme
THINK: Office wall sign.
THINK: Cerebrate.