and to use their land instead to seek the kingdom of God? Of course, it's not clear what it means to use land to seek the kingdom of God, but we can set that issue aside for a moment.
When you plant crops, you think ahead to the day of harvest. On any given day, Christians are supposed to extend their economic thinking only to events that will occur on the same day. If there is a heavenly father, then presumably the heavenly father knows that human beings require food. Otherwise, the heavenly father is very ignorant.
You could say that the verses contain some exaggerations designed to make a point, but it doesn't look that way. It looks as though there's alleged to be some way for people to serve God that will obligate God to become an economic servant of human beings. Furthermore, Christianity commands Christians to refrain from work that is calculated to have future benefits beyond the day of the work, and to instead do whatever it is that is considered service to God. (Perhaps feeding the hungry? Well, there might not be much food to feed them, but there will be plenty of hungry people if all Christian farmers stop growing food.)
Matthew 6, King James Version (public domain)
24 No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon.
25 Therefore I say unto you, Take no thought for your life, what ye shall eat, or what ye shall drink; nor yet for your body, what ye shall put on. Is not the life more than meat, and the body than raiment?
26 Behold the fowls of the air: for they sow not, neither do they reap, nor gather into barns; yet your heavenly Father feedeth them. Are ye not much better than they?
27 Which of you by taking thought can add one cubit unto his stature?
28 And why take ye thought for raiment? Consider the lilies of the field, how they grow; they toil not, neither do they spin:
29 And yet I say unto you, That even Solomon in all his glory was not arrayed like one of these.
30 Wherefore, if God so clothe the grass of the field, which to day is, and to morrow is cast into the oven, shall he not much more clothe you, O ye of little faith?
31 Therefore take no thought, saying, What shall we eat? or, What shall we drink? or, Wherewithal shall we be clothed?
32 (For after all these things do the Gentiles seek) for your heavenly Father knoweth that ye have need of all these things.
33 But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you.
34 Take therefore no thought for the morrow: for the morrow shall take thought for the things of itself. Sufficient unto the day is the evil thereof.