Charles Spurgeon wrote:
God employs his people to encourage one another.
We should be glad that God usually works for man by man. It forms a bond of brotherhood, and being mutually dependent on one another, we are fused more completely into one family.
Brethren, take the text as God's message to you. Aim to comfort the sorrowful, and to animate the desponding.
Speak a word in season to him that is weary, and encourage those who are fearful to go on their way with gladness.
God encourages you by his promises; Christ encourages you as he points to the heaven he has won for you, and the Spirit encourages you as he works in you to will and to do of His own will and pleasure.