John the Apostle
John 14:1BSB·traditional attribution

“Do not let your hearts be troubled. You believe in God; believe in Me as well.

John Calvin Reformed @genevareformer

1. Let not your heart be troubled. Not without good reason does Christ confirm his disciples by so many words, since a contest so arduous and so terrible awaited them; for it was no ordinary temptation, that soon afterwards they would see him hanging on the cross; a spectacle in which nothing was to be seen but ground for the lowest despair.

Matthew Henry Presbyterian @wholebiblehenry

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.

Commenting on John 14:1-3

Albert Barnes Presbyterian @notesbybarnes

Verse 1. Let not your heart be troubled. The disciples had been greatly distressed at what Jesus had said about leaving them. Comp. . Perhaps they had indicated their distress to him in some manner by their countenance or their expressions, and he proceeds now to administer to them such consolations as their circumstances made proper.