אַֽל־תִּ֭תְהַלֵּל בְּי֣וֹם מָחָ֑ר כִּ֤י לֹא־תֵ֝דַ֗ע מַה־יֵּ֥לֶד יֽוֹם׃
Huwag kang magmalaki tungkol sa araw ng bukas, sapagkat hindi mo alam kung ano ang maidudulot ng isang araw.
Rashi
Do not boast Do not boast now concerning a thing that is destined to be tomorrow.
Rashi
for you do not know what the day will bear Perhaps the day will bear some evil that will nullify it.