Believe Me that I am in the Father and the Father is in Me—or at least believe on account of the works themselves.
You know the way better than you think. Christ is willing to make the best of your weak knowledge, seeing good in you that you cannot yet see in yourselves. Thomas shows modesty in his ignorance, and Christ's word stirs him to seek further light rather than settle for confusion.
AI summary
Commenting on John 14:4-11
Believe me that I am in the Father, and the Father in me,.... Take my word for the truth of this; you may assure yourselves that nothing is more certain; but if you will not believe upon my saying so, either believe for the sake of the doctrines I have preached unto you, which are such as never any mere man spoke, and which have...
Verse 11. Believe me, &c. Believe my declarations that I am in the Father, &c. There were two grounds on which they might believe; one was his own testimony, the other was his works. Or else. If credit is not given to my words, let there be to my miracles. For the very works' sake. On account of the works; or, be convinced by the miracles themselves.