Firmly resolve on this in your mind

"Remember, you are not to prepare your defense beforehand,
 for I myself shall give you a wisdom in speaking that all your adversaries will be powerless to resist or refute."  (Luke 21: 14 -15)

When you wake up in the morning and stand before God in prayer, there  are a number of truths that you must affirm strongly in your mind. Here are my favorites:

This is the day the Lord has made, I shall be glad and rejoice in it.
I shall serve the Lord today.
The Lord is my Good Shepherd, I shall lack nothing today.
No fears, worries or doubts today.

Resolve in your mind from the first moment of your day and let it be a rule never to be departed to trust in God's Providence every step and every moment of this day.

I found an interesting commentary on Luke 21: 14 - 15 in Matthew Henry Online Commentary:

" "God will stand by you, and own you, and assist you, in your trials; you are his advocates, and you shall be well furnished with instructions, v. 14, v. 15. Instead of setting your hearts on work to contrive an answer to informations, indictments, articles, accusations, and interrogatories, that will be exhibited against you in the ecclesiastical and civil courts, on the contrary, settle it in your hearts, impress it upon them, take pains with them to persuade them not to meditate before what you shall answer; do not depend upon your own wit and ingenuity, your own prudence and policy, and do not distrust or despair of the immediate and extraordinary aids of the divine grace. Think not to bring yourselves off in the cause of Christ as you would in a cause of your own, by your own parts and application, with the common assistance of divine Providence, but promise yourselves, for I promise you, the special assistance of divine grace: I will give you a mouth and wisdom.’’ This proves Christ to be God; for it is God’s prerogative to give wisdom, and he it is that made man’s mouth. Note, First, A mouth and wisdom together completely fit a man both for services and sufferings; wisdom to know what to say, and a mouth wherewith to say it as it should be said. It is a great happiness to have both matter and words wherewith to honour God and do good; to have in the mind a storehouse well furnished with things new and old, and a door of utterance by which to bring them forth. Secondly, Those that plead Christ’s cause may depend upon him to give them a mouth and wisdom, which way soever they are called to plead it, especially when they are brought before magistrates for his name’s sake. It is not said that he will send an angel from heaven to answer for them, though he could do this, but that he will give them a mouth and wisdom to enable them to answer for themselves, which puts a greater honour upon them, which requires them to use the gifts and graces Christ furnishes them with, and redounds the more to the glory of God, who stills the enemy and the avenger out of the mouths of babes and sucklings. Thirdly, When Christ gives to his witnesses a mouth and wisdom, they are enabled to say that both for him and themselves which all their adversaries are not able to gainsay or resist, so that they are silenced, and put to confusion. This was remarkably fulfilled presently after the pouring out of the Spirit, by whom Christ gave his disciples this mouth and wisdom, when the apostles were brought before the priest sand rulers, and answered them so as to make them ashamed, Acts. 4, , 5, and 6.[3.]"