2 Peter 3:8

Be not ye ignorant Whatever they are; of this one thing Which casts much light on the point in hand; that one day is with the Lord as a thousand years, and a thousand years as one day This is an allusion to Psalms 90:4, where Moses had said, A thousand years in thy sight are as one day, which words St. Peter applies with regard to the period intervening between the time when he wrote, and the last day; denoting thereby, 1st, God's eternity, whereby he exceeds all measure of time in his essence and in his operation: 2d, His knowledge, to which all things past, or to come, are present every moment: 3d, His power, which needs no long delay in order to bring his work to perfection: and, 4th, His long-suffering, which excludes all impatience of expectation and desire of making haste. But it must be observed, that neither the apostle nor the psalmist meant that God does not perceive any difference between the duration of a day and that of a thousand years; but that these differences do not affect either his designs, or actions, or felicity, as they do those of finite creatures. So that what he brings to pass on the day he declares his purpose, is not more certain than what he will bring to pass a thousand years after such declaration. In like manner, what is to be brought to pass a long time after his declaration, is not less certain than if it had been done when declared. See Abernethy's Sermon's, vol. 1. p. 218. The apostle's meaning is in substance, that in one day, yea, in one moment, he could do the work of a thousand years; therefore he is not slow, he is always equally able, equally ready to fulfil his promise; and a thousand years, yea, the longest time, is no more delay to the eternal God than one day is to us: therefore he is longsuffering; he gives us space for repentance without any inconvenience to himself. In a word, with God time passes neither slower nor swifter than is suitable to him and his economy. Nor can there be any reason why it should be necessary for him either to delay or hasten the end of all things. How can we comprehend this? If we could have comprehended it, St. Peter needed not to have added, with the Lord.