The Lord shall open unto thee his good treasure. (Deuteronomy 28:12)
This refers first to the rain. The Lord will give this in its season. Rain is the emblem of all those celestial refreshings which the Lord is ready to bestow upon His people. Oh, for a copious shower to refresh the Lord’s heritage!
We seem to think that God’s treasury can only be opened by a great prophet like Elijah, but it is not so, for this promise is to all the faithful in Israel, and, indeed, to each one of them. O believing friend, “the Lord shall open unto thee his good treasure.” Thou, too, mayest see heaven opened and thrust in thy hand and take out thy portion, yea, and a portion for all thy brethren round about thee. Ask what thou wilt, and thou shalt not be denied if thou abidest in Christ and His words abide in thee.
As yet thou has not known all thy Lord’s treasures, but He shall open them up to thine understanding. Certainly thou hast not yet enjoyed the fullness of His covenant riches, but He will direct thine heart into His love and reveal Jesus in thee. Only the Lord Himself can do this for thee; but here is His promise, and if thou wilt hearken diligently unto His voice and obey His will, His riches in glory by Christ Jesus shall be thine.
C.H. Spurgeon, Faith’s Checkbook