William Burkitt on John 15:16

Here our Saviour gives another instance and evidence of his love to his disciples; he tells them, that his mercy and free goodness had prevented them in their election to eternal salvation, and in their vocation unto the office of apostleship: Ye have not chosen me, to be your Master and Lord, but I have chosen you, to be my disciples, friends, and servants.

2. He acquaints them with the end, design, and intention, of his chusing of them; namely, that they should bring forth fruit, and persevere therein, even in all the fruits of holiness and obedience, which are the praise and glory of God by Jesus Christ: I have ordained you, that you should bring forth fruit, and that your fruit should remain.

3. He directs them, that in order to their being fruitful, they should have access to the Father through him for whatsoever they wanted and stood in need of: Whatever ye shall ask of the Father in my name, he will give it to you.

Learn hence, That all those whom God hath chosen, and called to the knowledge and service of Jesus Christ, ought to make it their care and endeavour to bring forth fruit, and to persevere therein to their lives end: I have chosen you, that you should bring forth fruit, and that your fruit should remain.