means blablabla should be the way to go. in this case : Jesus told them, act like a child should be the way to go.
做好榜样才行。behave good should be the way to go.
做完作业才行。finish your homework should be the way to go.
30 ตุลาคม 2014
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才行means it is okay. it is good.
as you said 耶稣告诉这些大人,他们的态度要变得像小孩一样才行
this 才行 is to make a compliment of the previous sentence. to confirm the sentence as a 'good way'