– “Whatever thy trials or difficulties may be, I shall always give thee grace to support thee under and bring thee through them.”
According to thy days – all circumstances and vicissitudes, so shall thy Rest be – while faithful to thy God no evil shall touch thee; thy days shall increase, and thy quiet be lengthened out. This is an unfailing promise of God: “I will keep him in perfect peace whose mind is stayed upon me, because he trusteth in me;” therefore “trust ye in the Lord forever, for in the Lord Jehovah is everlasting strength;” Isa 26:4.
So shall thy strength be, i.e. thy strength shall not be diminished with thine age, but thou shalt have the rigour of youth even in thine old age; thy tribe shall grow stronger and stronger.
Isaiah 40:29 He giveth power to the faint; and to them that have no might he increaseth strength.
Isaiah 41:10 Fear thou not; for I am with thee: be not dismayed; for I am thy God: I will strengthen thee; yea, I will help thee; yea, I will uphold thee with the right hand of my righteousness.
1 Corinthians 10:13 There hath no temptation taken you but such as is common to man: but God is faithful, who will not suffer you to be tempted above that ye are able; but will with the temptation also make a way to escape, that ye may be able to bear it.
Ephesians 6:10 Finally, my brethren, be strong in the Lord, and in the power of his might.
Philippians 4:13 I can do all things through Christ which strengtheneth me.