John 15:16 (KJV)
16 Ye have not chosen me, but I have chosen you, and ordained you, that ye should go and bring forth fruit, and that your fruit should remain: that whatsoever ye shall ask of the Father in my name, he may give it you.
The Bible says that we are blessed if our confidence is in the Lord. We will be like trees planted by the waters that continue to bear fruit (see Jeremiah 17:7-8).
I admit that sometimes, at the end of a day, we may feel that all of our fruit has been picked! But God will replenish us if we abide in Him. If we put our trust in God, we will bear all kinds of fruit, and will have new fruit to share with others every morning.