I have stumbled upon instances where "は + verb" is used in situations where I thought "を + verb" should be used. For example recently I've seen "その覚悟はしてました" (I was prepared for that) and "楽な道は選ぶな" (don't choose an easy road).
Is there a difference? And if there is, what's the "rule" when to use "は" instead of "を"?
Thanks in advance.