John Gill Commentary Luke 12:29

"And seek not ye what ye shall eat, and what ye shall drink, neither be ye of doubtful mind." — Luke 12:29 (ASV)

And seek not what you are to eat, or what you are to drink ,
&c.] That is, in an anxious and distressing manner, with a tormenting and vexatious care;

otherwise food is to be both asked of God every day, and to be sought for and after in the use of proper means:

neither be you of doubtful minds ;
questioning and distrusting that you will have any thing to eat or drink:

be not fickle, unstable, and inconstant, and wandering in your thoughts about these things, like the meteors in the air, which are carried about here and there;

let not your minds be disturbed and distracted about them; or be anxiously solicitous for them; (See Gill on Matthew 6:31).