In John chapters 14-16, the Lord delivers a series of important lessons and truths. Highlights from John 14 are as follows:
There are many mansions in His Father's house prepared for His disciples (John 14:1-3).
Jesus is the way the truth and the life and no man comes to the Father but by Him.(John 14:6).
One knows the Father by knowing the Son (John 14:7-14; See also John 1:18).
If you love Him, you will keep His commandments (John 14:15, 21, 23).
Jesus promised the apostles a Comforter, the "Spirit of truth" (John 14:16-18, 26; See also John 16:12-16).
Highlights from John 15 are as follows:
Jesus is the vine and the Father is the husbandman (John 15:1-8). Each disciple is a branch. As long as the branch remains attached to the vine and bears fruit it is purged (pruned) so that it brings forth more fruit. As long as we remain attached to the vine we bring forth fruit. If we do not bring forth fruit, we are removed and cast out to be burned.
If we keep the Lord's commandments, we abide in his love as He kept the Father's commandments and abides in His Love (John 15:9-11).
It is the Lord's commandment that we love one another as He has loved us (John 15:12, 17)
There is no greater love than to lay down one's life for His friends (John 15:13-14).
The world would hate the apostles because it hated Him (John 15:18-27).