And though you beginning was small, yet your end should greatly increase
The small thing will develop into something great. A blessing for prosperity and growth (מְצַעֵר means small, insignificant. יִשְׂגֶּה means growth).
("And your head shall be full of sorrow, and your back shall be very sore" - Job 8:7, and so: "And his head shall be full of sorrow, and his back shall be very sore, though not many, but he shall be proud and secure in his heart, through the mercy of the Lord he shall be blessed" - Agnon/ This and That, and the crooked shall be made straight, 87)
Translation
Expression (Hebrew)
וְהָיָה רֵאשִׁיתְךָ מִצְעָר וְאַחֲרִיתְךָ יִשְׂגֶּה מְאֹד
Definition (Hebrew)
הַדָּבָר הַקָּטָן יִתְפַּתֵּחַ לִגְדֹּל. בְּרָכָה לְשִׂגְשׂוּג וּגְדִילָה (מְצַעֵר מַשְׁמָע מְעַט, מִזְעָר, חֲסַר חֲשִׁיבוּת. יִשְׂגֶּה מַשְׁמָע צֶמַח).
("וְהָיָה רֵאשִׁיתְךָ מִצְעָר וְאַחֲרִיתְךָ יִשְׂגֶּה מְאֹד"- אִיּוֹב ח ז, וְכֵן:"וְהָיָה רֵאשִׁיתוֹ מִצַּעַר וְאַחֲרִיתוֹ ,אָמְנָם לֹא רַבָּה, אוּלָם סָמוּךְ וּבָטוּחַ לִבּוֹ בְּרַחֲמֵי הַשֵּׁם יִתְבָּרַךְ"-עַגְנוֹן/ אֵלּוּ וָאֵלּוּ, וְהָיָה הֶעָקֹב לְמִישׁוֹר, 87)