John, hearing of Jesus’ works, is seized with doubt as to whether He is really the Messiah or not. (…) The text emphasizes that John is in prison, and this, as well as being a physical place, makes us think of the inner situation he is experiencing: in prison there is darkness, there is no possibility of seeing clearly and seeing beyond it. In effect, the Baptist is no longer able to recognize Jesus as the awaited Messiah. He is assailed by doubt, and he sends the disciples to check: “Go and see if he is the Messiah or not”. (…)

But this means that even the greatest believer goes through the tunnel of doubt. And this is not a bad thing; on the contrary, sometimes it is essential for spiritual growth: it helps us understand that God is always greater than we imagine Him to be. His works are surprising compared to our calculations; His actions are different, always, they exceed our needs and expectations; and therefore, we must never stop seeking Him and converting to His true face. (…) This is what the Baptist does: in doubt, he still seeks Him, questions Him, “argues” with Him and finally rediscovers Him. John, defined by Jesus as the greatest among those born of women (cf. Mt 11:11), teaches us, in short, not to close God within our own mindsets. This is always the danger, the temptation: to make ourselves a God to our measure, a God to use. And God is something else. (Pope Francis, Angelus, 11 December 2022)