John 14:1

In these verses we have, I. A general caution which Christ gives to his disciples against trouble of heart (Joh 14:1): Let not your heart be troubled. They now began to be troubled, were entering into this temptation. Now here see, 1. How Christ took notice of it. Perhaps it was apparent in their looks; it was said (Joh 13:22), They looked one upon another with anxiety and concern, and Christ looked upon them all, and observed it; at least, it was intelligible to the Lord Jesus, who is acquainted with all our secret undiscovered sorrows, with the wound that bleeds inwardly; he knows not only how we are afflicted, but how we stand affected under our afflictions, and how near they lie to our hearts; he takes cognizance of all the trouble which his people are at any time in danger of being overwhelmed with; he knows our souls in adversity. Many things concurred to trouble the disciples now. (1.) Christ had just told them of the unkindness he should receive from some of them, and this troubled them all. Peter, no doubt, looked very sorrowful upon what Christ said to him, and all the rest were sorry for him and for themselves too, not knowing whose turn it should be to be told next of some ill thing or other they should do.

— Matthew Henry's Concise Commentary (public domain)