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Matthew 6:33 But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you.
The explanation is in what has gone before in the chapter. We cannot serve God and Mammon (material wealth). If we believe and obey the gospel and make attaining to the kingdom of God the over-riding priority in our lives; if we subjugate our will to the will of God and work the works of God, then we needn’t be anxious about food and clothing in this life. This doesn’t mean we needn’t work for our living, rather that the pursuit of the necessities of this life must not be allowed to choke our spiritual growth.
Matthew 13:22 He also that received seed among the thorns is he that heareth the word; and the care of this world, and the deceitfulness of riches, choke the word, and he becometh unfruitful.
We can have faith that God will provide for our needs.
Psalms 37:25 I have been young, and now am old; yet have I not seen the righteous forsaken, nor his seed begging bread.
Paul says this:
Acts 20:34 Yea, ye yourselves know, that these hands have ministered unto my necessities, and to them that were with me.
1 Thessalonians 2:9 For ye remember, brethren, our labour and travail: for labouring night and day, because we would not be chargeable unto any of you, we preached unto you the gospel of God.
2 Thessalonians 3:8 Neither did we eat any man’s bread for nought; but wrought with labour and travail night and day, that we might not be chargeable to any of you:
Philippians 3:8 Yea doubtless, and I count all things but loss for the excellency of the knowledge of Christ Jesus my Lord: for whom I have suffered the loss of all things, and do count them but dung, that I may win Christ, 9 And be found in him, not having mine own righteousness, which is of the law, but that which is through the faith of Christ, the righteousness which is of God by faith: 10 That I may know him, and the power of his resurrection, and the fellowship of his sufferings, being made conformable unto his death; 11 If by any means I might attain unto the resurrection of the dead. 12 Not as though I had already attained, either were already perfect: but I follow after, if that I may apprehend that for which also I am apprehended of Christ Jesus. 13 Brethren, I count not myself to have apprehended: but this one thing I do, forgetting those things which are behind, and reaching forth unto those things which are before, 14 I press toward the mark for the prize of the high calling of God in Christ Jesus.
The kingdom of God is to be established when Christ returns to the earth. Those who have believed the gospel; been baptised into Christ and lived their lives by his commandments will be raised from the dead and be given everlasting life.
Acts 8:12 But when they believed Philip preaching the things concerning the kingdom of God, and the name of Jesus Christ, they were baptized, both men and women.
Hebrews 9:28 So Christ was once offered to bear the sins of many; and unto them that look for him shall he appear the second time without sin unto salvation.
If you want to come to grips with what the Bible really teaches, why not take the free Bible study course available on www.thisisyourbible.com? This course will give you a background in the major themes of the Bible from Genesis to Revelation.
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I hope this helps.