The world runs on a "clock" that operates under assumptions that are different than those revealed in the Scriptures.... The "wisdom of this world" (σοφία τοῦ κόσμου τούτου) is the prevailing cultural spirit that suppresses the reality of God's Presence and truth. Such "wisdom" is regarded as foolishness before God, and God has promised to "seize the so-called wise in their own craftiness" (1 Cor. 3:19). The life of faith, on the other hand, sees what is invisible. Faith (emunah) apprehends "the substance (ὑπόστασις) of things hoped for, the assurance (ἔλεγχος, conviction, "correction," "argument," i.e., tokhachat: תוֹכַחַת) of things not seen" (Heb 11:1). As the Scripture says, the heart of faith "looks not to the things that are seen but to the things that are unseen. For the things that are seen are transient, but the things that are unseen are eternal" (2 Cor. 4:18).
The Sabbath that immediately precedes (and sometimes falls on) the Biblical New Year is called Shabbat HaChodesh (שַׁבַּת הַקּדֶשׁ), the "Sabbath of the Month" (of Nisan). This Sabbath is significant because it marks the start of the month of Redemption (i.e., the first month called Nisan) which God called "the beginning of months" (i.e., Rosh Chodashim). We honor this event by reading an additional passage from the Torah concerning the sanctification of the new moon (Exod. 12:1-20), and we spiritually prepare for this month by studying about Passover and the coming spring holidays:
The commandment to sanctify the first new moon of the year (i.e., Rosh Chodashim) reveals that it is our responsibility to sanctify (i.e., observe) Biblical time in general. In other words, when we observe "the beginning of months," we are acknowledging that time itself is rooted in the Biblical calendar with its divinely inspired cycle of festivals (i.e., the moedim). Note that this year the Biblical New Year begins on Monday, March 27th at sundown, and therefore Passover begins exactly two week weeks later, Monday, April 10th at sundown:
Originally Rosh Chodashim was simply called the "first month" because it marked the month of the Exodus and the other months were named in relation to it, similar to the days of the week in the Hebrew calendar (i.e., the first day, the second day...). Later it was called Chodesh Ha-Aviv (חדֶשׁ הָאָבִיב) - "the springtime month" (because the calendar is reset in the spring) and later still as Nisan (נִיסָן), to recall God's faithfulness after the Babylonian Exile (Neh. 2:1; Esther 3:7). So important is this month that the Jewish sage Rabbi Moshe ben Nachman (Ramban) wrote regarding the commandment to observe Rosh Chodashim:
"The verses (Exod. 12:1-2) mean that this month should be counted first, and beginning with it, the count should proceed to the second, the third, and so on, till the end of the sequence with the twelfth month. In this way, this month should be a commemoration of the Great Miracle (i.e., our Redemption), and every time we mention the months, the Miracle will be alluded to. It is for that reason that the months do not have names in the Torah, but rather they are identified by number."
The word Nisan might come from either the word nitzan (נִצָּן), meaning "bud" (Song 2:12), or the word nissim (נִסִּים) meaning "miracles," both of which suggest physical and spiritual resurrection in our lives. Others think the word comes from the verb nus (נוּס), meaning "to flee," both in relation to Israel's flight from Egypt and Egypt's flight from Israel (i.e., when the pursuing Egyptian cavalry fled (נָסִים) before the sea closed upon them (Exod. 14:25, 27). We also see this usage in the verse: "The wicked flee (נָסוּ) when no one pursues, but the righteous are bold as a lion" (Prov. 28:1). The devil's power is found in the lie. If he can make you afraid, you will not think clearly. Establishing your faith in the truth will embolden you to deal with the lies and distortions that are intended to enslave you in fear. As Yeshua said, the truth will set you free (John 8:32).