In thee, O Lord,
do I put my trust: let me never be put to confusion.

Be thou my strong habitation,
whereunto I may continually resort:
thou hast given commandment to save me;
for thou art my rock and my fortress.

For thou art my hope, O Lord God:
thou art my trust from my youth.

Let my mouth be filled with thy praise
and with thy honour all the day.

Cast me not off in the time of old age;
forsake me not when my strength faileth.

I will go in the strength of the Lord God:
I will make mention of thy righteousness,
even of thine only.

Thy righteousness also, O God,
is very high, who hast done great things:
O God, who is like unto thee!

Source: Psalm 71

I wonder what circumstances made this very real for David in Psalm 70:

Make haste, O God, to deliver me;
make haste to help me, O Lord.

Let all those that seek thee
rejoice and be glad in thee:
and let such as love thy salvation
say continually,
Let God be magnified.

But I am poor and needy:
make haste unto me, O God:
thou art my help and my deliverer;
O Lord, make no tarrying.

Amen.