From all of this [which we have learned about the attribute of placing one’s trust in HaShem], we are able to understand of the greatness of [the degree of] trust which a person should [place] in The Holy One, Blessed is He.
 The entire pasuk from sefer “Yishayahu”, states as follows:
“[Place your] trust in HaShem forever, for in "י-ה" – Ya-h, HaShem, [is The] Rock of the worlds.” (Yishayahu: 26; 4)
The RaDa”K explains that it is fitting to place one’s trust in HaShem, as He is The “Rock of the worlds”, meaning, HaShem is The Source of strength for all time and for all of the worlds, and HaShem is thereby is the One who provides life to all of the worlds.
The MaLBI”M explains that in order for one to place one’s complete trust in someone, that person would need to fulfill two criterion: 1) The ability to fulfill the request of the one who wishes to place his trust in him, and 2) the persistence necessary to ensure that his ability to carry out the request will not be hindered or lost, or that his will and desire to carry out the request will not change.
The MaLBI”M explains that HaShem fulfills the above two criterion are fulfilled by HaShem, as 1) He is exists constantly and for all time, and 2) HaShem is The “Rock of the worlds”, He being the strength of all of the worlds, as all of the worlds rely on Him and they all exist due to Him. The MaLBI”M explains that it is only HaShem who fulfills these criterion, – He exists for all time and possesses the ability to provide for the needs of the one who trusts in Him.
The above follows that which is written in “Shmuel I” (15; 29), as follows:
“And also The Strength of Israel (i.e. HaShem) will not lie and will not regret [that which He had promised to do], for He is not a person to change His mind.” (Translation follows RaSh"I)
RaDa”K explains that HaShem will not renege on carrying through the good which He promised to bestow upon the person. In contrast, a person may change their mind and regret having made a given commitment due to anger or not possessing the same desire to carry out his promise.
 The b'racha of “Yotzeir” begins the the blessings prior to “K'rias Shema” - “The Recitation of the Shema”.
 See note #2 on the Twenty-Third day of Teves.
 The gemara in maseches “Menachos” (29b), quoting Rabbi Ami, explains, based on the aforementioned pasuk quoted from sefer “Yishayahu”, that HaShem will be a shelter, both in this world and in The World to Come, for anyone who places their trust in HaShem. The gemara then goes on to explain that HaShem created this world with the letter “hei” and created The World to Come with the letter “yood”. There is an opening at the bottom of the “hei” to allow those who wish to sin, the ability to do so. The opening at the upper-left part of the “hei” is for those who wish to perform teshuvah for their sins, for which they will require Heavenly assistance. The gemara explains that the “yood” is small, as the number of righteous in The World to Come is small, and it is bent, as the righteous people in The World to Come have their heads bent as the good deeds of a given righteous individual would be different than any other righteous individual, and, as RaSh”I notes, the honor of one righteous person will be greater than that of another righteous person, and therefore, as a given righteous individual is ashamed of the superiority of the other person, in a given matter.