William Burkitt on Luke 12:31

As if Christ had said, let your first and chief care be to promote the kingdom of grace in this world, and to secure the kingdom of glory in the next, and then fear not the want of these outward comforts; they shall be added in measure, though not in excess; to satisfy, though not to satiate; for health, though not for surfeit.

Learn,

1. That Christians ought not to be so solicitoous about the necessaries and conveniences of this life, as about the happiness of the next: Rather seek ye the kingdom of God.

2. That heaven or the kingdom of God, must be sought in the first place; that is, with our principal care and chief endeavors.

3. That heaven being once secured by us, all earthly things shall be super added to us as God sees needful and convenient for us. But few men like our Saviour's method; they would seek the things of this world in the first place, and get to heaven at last; they would be content to seek the world and to have heaven thrown in without their seeking: but his will not be granted: if we make religion, and the salvation of our souls, our first and chief care, all other things shall be added unto us, so far as the wisdom of God sees them fit and convenient for us.