"The habit of employing self-deception to maintain one's self esteem has often become so ingrained that the first step to developing accurate self-awareness is honest acknowledgment of the existence of hidden emotions, motives and tendencies in the mind without immediately suppressing them."

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For those [observations] that I made in Leipzig in my youth and up to my 21st year, I usually call childish and of doubtful value. Those that I took later until my 28th year [i.e., until 1574] I call juvenile and fairly serviceable. The third group, however, which I made at Uraniborg during approximately the last 21 years with the greatest care and with very accurate instruments at a more mature age, until I was fifty years of age, those I call the observations of my manhood, completely valid and absolutely certain, and this is my opinion of them.

— Tycho Brahe