As your days, so shall your strength be.

The following verse is a blessing pronounced by Moses on the tribe of Asher, just before Moses' death.

Deuteronomy 33:25 (New International Version)
²⁵ The bolts of your gates will be iron and bronze, and your strength will equal your days.

Deuteronomy 33:25 (New King James Version)
²⁵ Your sandals shall be iron and bronze;
As your days, so shall your strength be.

Where "strength" = דּבא (dôbe', Strong's H1679), from an unused root (probably meaning to be sluggish, that is, restful); quiet: - strength. That means we have "your rest will be as your days," meaning, supposedly, their days (and ours, if we also inherit this blessing) will be restful. That's nice, but, according to the Blue Letter Bible folks, דּבא may be used poetically to mean death (as explained here). That would give us something like "your death will be like your life," which holds very little meaning for me. (This is the only occurrence of דּבא in the bible).

If we can find a New Testament verse that supports the rest (or strength) idea, then I will be more comfortable accepting that we are heirs of this blessing and that it refers to rest and not death, and that we can take this verse as saying "God will give you rest in your days". We can generalise the idea a little, to "God will give you enough grace and strength for each day such that it won't be overly burdensome and you will be able to find rest". This is supported by some NT verses:

Matthew 6:25-34 (New International Version)
Do Not Worry
²⁵"Therefore I tell you, do not worry about your life, what you will eat or drink; or about your body, what you will wear. Is not life more important than food, and the body more important than clothes? ²⁶Look at the birds of the air; they do not sow or reap or store away in barns, and yet your heavenly Father feeds them. Are you not much more valuable than they? ²⁷Who of you by worrying can add a single hour to his life?
²⁸"And why do you worry about clothes? See how the lilies of the field grow. They do not labor or spin. ²⁹Yet I tell you that not even Solomon in all his splendor was dressed like one of these. ³⁰If that is how God clothes the grass of the field, which is here today and tomorrow is thrown into the fire, will he not much more clothe you, O you of little faith? ³¹So do not worry, saying, 'What shall we eat?' or 'What shall we drink?' or 'What shall we wear?' ³²For the pagans run after all these things, and your heavenly Father knows that you need them. ³³But seek first his kingdom and his righteousness, and all these things will be given to you as well. ³⁴Therefore do not worry about tomorrow, for tomorrow will worry about itself. Each day has enough trouble of its own.

Matthew 11:29-30 (New International Version)
²⁹Take my yoke upon you and learn from me, for I am gentle and humble in heart, and you will find rest for your souls. ³⁰For my yoke is easy and my burden is light."

Matthew 6:8,11 (New International Version)
⁸Do not be like them, for your Father knows what you need before you ask him.
...
¹¹Give us today our daily bread.

1 Corinthians 10:13 (New International Version)
¹³No temptation has seized you except what is common to man. And God is faithful; he will not let you be tempted beyond what you can bear. But when you are tempted, he will also provide a way out so that you can stand up under it.

2 Corinthians 12:9 (New International Version)
⁹But he said to me, "My grace is sufficient for you, for my power is made perfect in weakness." Therefore I will boast all the more gladly about my weaknesses, so that Christ's power may rest on me.

Note that many of these verses speak of strength for today. God seems to like to give us enough grace, enough strength, enough material resources, enough wisdom to carry out His will for today. Tomorrow He will give us what we need for tomorrow.

Matthew 10:19 (New International Version)
¹⁹But when they arrest you, do not worry about what to say or how to say it. At that time you will be given what to say,

Philippians 4:6-7 (New International Version - UK)
⁶ Do not be anxious about anything, but in everything, by prayer and petition, with thanksgiving, present your requests to God.
⁷ And the peace of God, which transcends all understanding, will guard your hearts and your minds in Christ Jesus.

I consider not having to worry about how we are going to making it through tomorrow to be restful, so these ideas are closely related.

Here's another thought about rest. Consider this passage:

Isaiah 32:17 (New International Version - UK)
¹⁷ The fruit of righteousness will be peace; the effect of righteousness will be quietness and confidence for ever.

This states that righteousness leads to peace and the ability to rest in confidence. The Hebrew word for quietness is שׁקט (shâqaṭ): A primitive root; to repose (usually figuratively): - appease, idleness, (at, be at, be in, give) quiet (-ness), (be at, be in, give, have, take) rest, settle, be still. Because Christ has become our righteousness (1 Cor 1:30), we should be operating out of a place of quiet assurance. I'm not sure if this also means we should strive to be more righteous to have more rest, but more likely to trust in Christ and the rest He offers.

1 Corinthians 1:30 (New International Version - UK)
³⁰ It is because of him that you are in Christ Jesus, who has become for us wisdom from God— that is, our righteousness, holiness and redemption.

Does anyone have any thoughts on the idea that we should strive to be more righteous in order to receive more rest? Any other comments on rest, in general?