1 Clemens 23

The all-merciful and beneficent Father has bowels [of compassion] towards those that fear Him, and kindly and lovingly bestows His favours upon those who come to Him with a simple mind. Wherefore let us not be double-minded; neither let our soul be lifted up on account of His exceedingly great and glorious gifts. Far from us be that which is written, Wretched are they who are of a double mind, and of a doubting heart; who say, These things we have heard even in the times of our fathers; but, behold, we have grown old, and none of them has happened unto us; You foolish ones! compare yourselves to a tree; take [for instance] the vine. First of all, it sheds its leaves, then it buds, next it puts forth leaves, and then it flowers; after that comes the sour grape, and then follows the ripened fruit. You perceive how in a little time the fruit of a tree comes to maturity. Of a truth, soon and suddenly shall His will be accomplished, as the Scripture also bears witness, saying, Speedily will He come, and will not tarry; and, The Lord shall suddenly come to His temple, even the Holy One, for whom you look. Malachi 3:1